PHASE EQUILIBRIUM DATA

SYSTEMS CONTAININGTHE VAPOR PHASE

One-Component SystemsVapor pressures up to two

atmospheresElementary substances.

P, S, Se, Te and halogens.H2, N2, 02, O3 and the zero-

group elements.

The metallic elements.Chemical compounds.

Crystal—vapor.»-Table.

Liquid—vapor.»-Table.(T-Table.

Vapor pressures between oneatmosphere and the critical

pointElementary substances.

P, S, Se, Te and the halogens.H2, N2, O2, O3 and thc zero-

group elements.Hg.

Chemical compounds.»-Table.(T-Table.Special tables.

Factors for the correctionof boiling points to nor-mal pressure.

Critical-point constants.

Flash points of combustibleliquids.

Two-Component SystemsTwo-phase systems. Solid—

vapor.Adsorption and solubilities of

gases in solids.

Two-phase systems. Liquid—vapor.

Solubilities of gases in liquids.

Isothermal systems.Partial and total vapor

pressures.Vapor-pressure lowering.

Isobaric systems.Both components volatile.

Boiling-point curves.

One component non-vola-tile. Boiling-point ele-vation.

SYSTÈMES CONTENANTLA PHASE VAPEUR

Systèmes à un constituantPressions de vapeur jusqu'à

deux atmosphèresSubstances élémentaires.

P, S, Se, Te et les halogènes.H2, N2, O2, O3 et les élé-

ments du groupe zéro (gasnobles).

Éléments métalliques.Composés chimiques.

Cristal—vapeur.Table ».

Liquide—vapeur.Table ».Table £.

Pressions de vapeur entre uneatmosphère et le point

critiqueSubstances élémentaires.

P, S, Se, Te, et les halogènes.H2, N2, O2, O3 et les gaz

nobles.Hg.

Composés chimiques.Table ».Table (L.Tables spéciales.

Facteurs pour ramener lespoints d'ebullition à lapression normale.

Constantes critiques.

Point d'inflammabilité descombustibles liquides.

Systèmes à deux constituantsSystèmes à deux phases.

Solide—vapeur.Adsorption et solubilités des

gaz dans les solides.

Systèmes à deux phases. Li-quide—vapeur.

Solubilités des gaz dans lesliquides.

Systèmes isothermes.Pressions partielles et to-

tales.Abaissement de la tension

de vapeur.Systèmes isobares.

Les deux constituants sontvolatils. Courbes d e spoints d'ebullition.

Un constituant non-vola til.Élévation du p o i n td'ébullition.

SYSTEME MIT DAMPF-PHASE

Einkomponenten SystèmeDampfdrucke bis zu zwei

AtmosphärenElementare Stoffe.

P, S, Se, Te und Halogene.H2, N2, O2, O3 und Edelgase.

Die metallischen Elemente.Chemische Verbindungen.

Kristall—Dampf.»-Tafel.

Flüssigkeit—Dampf.»-Tafel.(T-Tafel.

Dampfdrucke zwischen einerAtmosphäre und dem kri-

tischen PunktElementare Stoffe.

P, S, Se, Te und Halogene.H2, N2, O2, O3 und Edelgase.

Hg.Chemische Verbindungen.

»-Tafel.C-Tafel.Besondere Tafeln.

Faktoren für die Umrech-nung des Siedepunktesauf den normal Druck.

Konstante am kritischenPunkt.

Entzündungstemperaturfür brennbare Flüssig-keiten.

Zweikomponenten SystemeZweiphasen Systeme. Fest—

Dampf.Adsorption und Löslichkeit

von Gasen in festen Stoffen.

Zweiphasen Systeme. Flüssig-keit—Dampf.

Löslichkeiten von Gasen inFlüssigkeiten.

Isothermische Systeme.Partial- und Total-Dampf-

drucke.Dampfdruckerniedrigun-

gen.Isobare Systeme.

Beide Komponenten flüch-tig. Siedepunktskurven.

Eine Komponente nichtflüchtig. Siedepunktser-höhung.

SISTEMI CON FASEGASSOSA

Sistemi ad un componenteTensioni di vapore fino a due

atmosfere pAGE

Elementi.P, S, Se, Te ed alogeni.. 201H2, N2, O2, O3 e gas

nobili 202

Elementi metallici 204Composti.

Cristallo—vapore.Tabella » 207

Liquido—vapore.Tabella » 213Tabella d 215

Tensioni di vapore tra un'atmo-sfera ed il punto critico

Elementi.P, S, Se, Te ed alogeni. . 202H2, N2, O2, O3 e gas

nobili 203Hg 206

Composti.Tabella » 228Tabella £ 237Tabelle speciali.

Fattori per riportare ipunti di ebollizionealla pressione nor-male 246

Costanti critiche 248

Temperature di accen-sione di liquidi com-bustibili. Voi. II, p. 161

Sistemi a due componentiSistemi a due fasi. Soli-

do—vapore.Assorbimento e solubi-

lità del gas nelle so-stanze solide 249

Sistemi a due fasi. Li-quido—vapore.

Solubilità dei gas neiliquidi , . . . 254

Sistemi isotermi.Tensioni di vapore

parziali e totali.284, 301Abbassamento della

tensione di vapore284,292Sistemi isobari.

Entrambi i compo-nenti sono volatili.Curve dei punti diebollizione 308

Uno dei componentinon è volatile. In-nalzamento d e lpunto di ebollizione. 324

Two-phase systems. Liquid—vapor.—(Continued)

Orthobaric systems: P-T-Xrelations.

Three-phase systems. Crys-tal—crystal—vapor.

Relative efficiencies of dryingagents.

For other systems, v. "GeneralIndex" under Thermody-namic Chemistry.

Three-Component SystemsTwo-phase systems. Liquid—

vapor.At least one of the com-

ponents is a gas. Solu-bilities of gas mixtures inliquids and of gases insolutions.

Isothermal systems.At least two components

are volatile. Partialand total pressures.

One component only isvolatile. Vapor-pressurelowering.

Isobaric systems.At least two components

are volatile. Boiling-point curves.

Two components are non-volatile. Boiling-pointelevation.

Orthobaric systems: P-T-Xrelations.

Three- and four-phase systems.

Four-Component Systems

Solubilities of gases in solutions.

All other systems.

Systèmes à deux phases. Liquide—vapeur.—(Suite)

Systèmes orthobares : Rela-tions P-T-X.

Systèmes à trois phases.Cristal—cristal—vapeur.

Pouvoirs relatifs des agentsde séchage.

Pour d'autres systèmes, voir"General Index" sousThermodynamique chim-ique.

Systèmes à trois constituantsSystèmes à deux phases.

Liquide—vapeur.Un des constituants au moins

est un gaz. Solubilités desmélanges gazeux dans lesliquides et des gaz dans lessolutions.

Systèmes isothermes.Deux des constituants au

moins sont volatils.Pressions partielles ettotales.

Un des constituants seule-ment est volatil. Abais-sement de la tension devapeur.

Systèmes isobares.Deux des constituants au

moins sont volatils.Courbes des pointsd'ebullition.

Deux des constituants nesont pas volatils. Élé-vation du point d'ebulli-tion.

Systèmes orthobares : Rela-tions P-T-X.

Systèmes à trois et quatrephases.Systèmes à quatre constitu-

antsSolubilités des gaz dans les

solutions.Tous les autres systèmes.

Zweiphasen Systeme. Flüssig-keit—Dampf.—(Fortsetzung)

Orthobare Systeme: P-T-XBeziehungen.

Dreiphasen Systeme. Kris-tall—Kristall—Dampf.

Trocknungsfähigkeit ver-schiedener Stoffe.

Andere Systeme, siehe "Gen-eral Index" unter Kapitel" Chemische Thermodyna-mik."

Dreikomponenten SystemeZweiphasen Systeme. Flüssig-

keit—Dampf.Mindestens eine der Kom-

ponenten ist ein Gas. Lös-lichkeit von Gasmischun-gen in Flüssigkeiten undvon Gasen in Lösungen.

Isothermische Systeme.Mindestens zwei Kompo-

nenten sind flüchtig.Partial- und Total-Dampf drucke.

Nur eine Komponente istflüchtig. Dampfdruck-erniedrigungen.

Isobare Systeme.Mindestens zwei Kompo-

nenten sind flüchtig.Siedepunktskurven.

Nur eine Komponente istflüchtig. Siedepunktser-höhung.

Orthobare Systeme: P-T-XBeziehungen.

Drei- und Vier-Phasen Systeme.

Vierkomponenten Systeme

Gaslöslichkeit in Lösungen.

Alle anderen Systeme.

Sistemi a due fasi. Liquido—vapore.—(Continuazione)

Sistemi ortobari : Rap-porti tra P-T-X 351

Sistemi a tre fasi. Cri-stallo—cristallo—vapore.Potere essicante di

diverse sostanze 385Per altri sistemi, vedi

"General Index,'; Ter-modinamica.

Sistemi a tre componentiSistemi a due fasi. Li-

quido—vapore.Almeno uno dei com-

ponenti è gas. Solu-bilità dei miscugligasosi nei liquidi e deigas nelle soluzioni.... 254

Sistemi isotermi.Almeno due compo-

nenti sono volatili.Pressioni parziali epressione totale 284, 301

Uno solo dei compo-nenti è volatile.Abbassamento dellatensione di vapore.. 292

Sistemi isobari.Almeno due compo-

nenti sono volatili.Curve dei punti diebollizione 306, 308

Uno solo dei compo-nenti è volatile. In-nalzamento d e lpunto di ebollizione. 324

Sistemi ortobari : Rap-porto tra P-T-X.. 306, 351

Sistemi a tre e quattro Jasi 351

Sistemi a quattro componenti

Solubilità dei gas nellesoluzioni 272

Tutti gli altri sistemi 351

VAPOR PRESSURES OF P, S, SE, TE AND THE HALOGENSALAN W. C. MENZIES

THE CRYSTALLINE STATE

logloP=^!^^^^-B;pinmm(=^0An);^in °C,T = *+273.1

BK, BROMINE (16» 18> 31)

t, 0C I p, mm [ I / , 0 C I p, mm±5% ±5%

(-95) (0.0022) -45 1.83-90 0.0052 ±3%-85 0.0117 -40 2.98-80 0.0251 -35 4.77-75 0.0513 -30 7.45-70 0.102 -25 11.4-65 0.192 -20 17.1-60 0.357 -15 25.2-55 0.628 -10 36.6-50 1.09 - 7.3* 44.4

* M. P.

CL, CHLORINE (16)A = -29293; B = 9.950; accuracy, ±10%; range,

-154 to -1030C

I, IODINE (i, 2, 14, si)

/, 0C I p, mm Il t, 0C I PJ mm±5% ±1%

-50 0.0437 40 1.03-40 0.0319 50 2.16-30 0.O3SO 60 4.31-20 0.0030 70 8.22-10 0.0099 80 15.1

±1% 90 26.8O 0.0299 100 45.5

+ 10 0.0808 110 74.920 0.202 114.15* 90.130 0.471

*M. P.P, PHOSPHORUS (7> 24> 36)

For white P r A = -63 123; B = 9.6511; range, 20 to 44.10C(M. P.); error ±<10%.

For violet P: A = -108 510; B = 11.0842; range, 380 to ca.59O0C; accuracy ±5% above 50O0C.

S, SULFUR (13, 34)

t, 0C I p, mm [ I t, 0C I p, mm50 0.0002 90 0.004960 0.0004 100 0.01070 0.0010 110 0.02180 I 0.0023 114.5* 0.028f

* M. P. t ± 10 %.

SE, SELENIUM (i°)Hexagonal form

t, 0C I p, mm I ] t, 0C I p, mm±10% ±10% '

195 0.0010 210 0.0032200 0.0015 215 0.0047205 0.0022 I 217.4* 0.0055

*M. P.

THE LIQUID STATE UP TO ONE ATMOSPHERE

BR, BROMINE (4, is, 28, 31 )

t, 0C I Pi mm U t, 0C I p, mm±2% ±2%

-7.3* 44.4 30 264-5 50.5 35 324

O 65.9 40 392-f5 85.3 45 47210 109 50 56415 138 55 67020 173 58.78t 76025 214 (60) (793)

302|* M. P. t ± 0.03°. î Grit.

CL, CHLORINE (**» i*>» 2I9 29, 38)11

0C I p, mm u /, 0C I p, mm±5% ±3%

-103* 8.9 -50 363-100 11.8 -40 594-90 27.8 ±1%-80 58.7 -34.6 760

±3% ±2%-70 115 -30 935-60 211 -20 I 1398

*M. P.I, IODINE (31, 32, 37)

t, 0C I p, mm Il t, 0C I PJ mm±2% ±2%

114.15 90.1 160 394115 92.9 170 521120 111 180 679130 157 184.35* 760140 217 190 (869)150 294 I 553.41

* ±0.1°. t ±3°crit.

P, PHOSPHORUS (20, 24, 25, so, 36)OOQO 1

Iog10p,mm = 11.5694 --^F 1.2566 1Og10T7; range, 44.1 to

6350C; accuracy of p = ±7% except near the B. P., 279.70C,where it is ±2 % (equivalent to ± 1°).

S, SULFUR (3, 5, 6, 8, 9, 12, 13, 15, 17, 26, 27, 32, 33, 34, 39)

t, 0C I p, mm [ I t, 0C I p, mm±10% 250 12

114.5 M. P. 0.028 260 16120 0.040 270 21130 0.074 280 28140 0.13 290 37150 0.22 300 48160 0.37 310 60

±7% 320 76170 0.59 330 95180 0.91 ±5%190 1.4 340 118200 2.1 350 146210 3.1 360 179220 4.4 370 218230 6.3 380 263240 8.7

VAPOR PRESSURES OF THE ATMOSPHERIC GASESC. A. CROMMELIN

I. VAPOR PRESSURES UP TO TWO ATMOSPHERESp, in mm Hg ( = 1/760 An); t, in 0C (Leiden scale, v. Vol. I,

p. 54); the following equation applies over the range covered bythe tabulated data, except as otherwise indicated:

loglo pmm = ™C^ + B + CT + DT» + ET*

Trp. = triple point.

S.—(Continued)

t, 0C I p, mm I ) t, 0C I p, mm±3% ±<0.1%

390 325 444.60 760,0400 376 ±0.3%410 446 450 821

±1% ±3%420 525 460 948430 613 470 109s

±0.3% 480 125?440 711 ±5%

490 144i

t = 444.60 + 0.0910(p - 760) - 0.0449(p - 76O)2, for p = 695to 805 mm (±1-2 mm). Relative accuracy, ±0.1-0.2 mm (40).

SE, SELENIUM (*<>» 23, so)

t, 0C I p, mm [I t, 0C I p, mm±10% ±10%

217.4 M.P. 0.0055 480 28220 ' 0.0062 500 42225 0.0078 ±3%230 0.0097 620 313235 0.0120 640 420390 3.0 660 550400 4.0 680 700420 7.0 688 760440 11 700 865460 17 710 970

TE, TELLURIUM ("» 35)t, 0C I P1 mm U t, 0C I p, mm488 0.464 67Ï IO578 3.34 1390 760

VAPOR PRESSURES AND ORTHOBARIC DENSITIES ABOVEONE ATMOSPHERE

di (resp. dv) = density of saturated liquid (resp. vapor) in g per,cm'; dm = Y2(U1 + dv).

All values at the critical point are given in bold-face type.The latent heat of vaporization (I) in joules per g is given by

the equation:

I - O 10133 (±- IV *£ - Q-1013V1 - IW dlQS"PL - 0.10133 ̂ - djl. dT - Q 4343 ̂ djpl dT

CL, CHLORINE (16, 19, 21, 22, 29, 38)

t, 0C I P1 atm. di I dv

±1% ±0.5%-34.6 1.00 1.561

±2%-30 1.23 1.550-20 1.84 1.524-10 2.61 1.496

O 3.65 1.468 0.0128+ 10 4.96 1.438 0.0175

20 6.57 1.408 0.022630 8.60 1.377 0.0300

CL.—(Continued)

t, 0C I p, atm. I di dv—- -

40 11.1 1.344 0.038450 14.1 1.310 0.048660 17.6 1.375 0.060070 21.6 1.240 0.074080 26.2 1.199 0.091090 31.5 1.156 0.1125

100 37.6 1.109 0.136110 44.4 1.059 0.164120 52.4 0.998 0.206130 61.4 0.920 0.258140 71.4 0.750 0.405144+1 (76.1) 0.573

dm = 0.7403 - 0.0011618«.P, PHOSPHORUS (20, 24, 25, 30, 36)

For white and violet P: logio P1 mm = 11.5694 - 2898.1/77 —1.2566 logio T; (p ± 7%) range, 44.1 to 6350C (±2% near B. P.,279.70C); t, crit. = 720.6 ± 30C; p, crit. = 100 ± 10 atm. (cale,from equation).

S, SULFUR (5, 6, 8, 9, 12, 13, IS, 17, 26, 27, 32, 33, 34, 39)

t, 0C I p, mm Il t, 0C I p, mm±<0.1% : ± 5 %

444.6 760 500 164?±0.3% 510 1876

450 821 520 213o±3% 530 241o

460 948 540 271s470 109s 550 305s480 125? 560 342s

±5% 570 3824490 144i 1040 ± 5°

LITERATURE(For key to the periodicals see end of volume)

O) Baxter and Grose, 1, 37: 1061; 15. (2) Baxter, Hickey and Holmes, /, 29 :127; 07. (3) Bodenstein, 7, 30: 113; 99. (4) Bouzat and Leluan, 34, 178:635; 24. (5) Callendar and Griffiths, 68, 182A: 119; 91. («) Callendar andMoss, ot 84: 595; 10. (7) Centnerszwer, 7, 85: 99; 13. (8) Chappuis, 238,16; 14. (9) Day and Sosman, 12, 38: 517; 12.

(1O) Dodd, 1, 42: 1579; 20. (11J Doolan andPartington,S3,20:342;24. (^)Eumorfopoulos, 5, 90: 189; 14. (13) Gruener, 1, 29: 1396; 07. (14) Haberand Kerschbaum, 9, 20: 296; 14. (15) Harker and Sexton, 133, 1908: 621.(16) Henglein, Rosenberg and Mtichlinski, 96,11:1; 22. (i?) Holborn andHenning, 8, 35: 761; 11. (18) Isnardi, 8, 61: 264; 20. (19) Johnson andMclntosh, 1, 81: 1138; 09.

(20) Jolibois, 34, 149: 287; 09. (21) Knietsch, 13, 259: 100; 90. (22) Lange.92, 1900: 683. (23) LeChatelier, 34, 121: 323; 95. (2*) MacRae and VanVoorhis, 1, 43: 547; 21. (25) Marckwald and Helmholtz, 93, 124: 81; 22.(26) Matthies, 63, 7: 395; 06. (27) Mueller and Burgess, 31, No. 339; 19.(28) Nadezdin, Kiev Univ. Unters., 6: 32; 85. 9: 721; 85. (29) Pellaton,42, 13: 426; 15.

(3O) Preuner and Brockmoeller, 7; 81: 129; 12. (31) Ramsay and Young, 4,49: 453; 86. (32) Rassow, 93, 114: 117; 20. (33) Regnault, 151, 26: 339;62. (34) Ruff and Graf, 93, 58: 209; 08. (3S) Saint-Claire Deville andTroost, 34, 91: 83; 80. (3*) Smits and Bokhorst, 7, 91: 249; 16. (37)Stelzner and Niederschulte, 96, 7: 159; 05. (38) Trautz and Gerwig, 93,134: 417; 24. (39) Waidner and Burgess, 31 A, No. 6: 149; 10.

1. Two^Phase, Crystal—Vapor, Sublimation Pressures

T f t° -189.19Trp. -207.62 A = -7 814.5 \ TTArg0n\ p 512.17 21.97 B = +7.5741 / (1)

f t° -169 Trp. -188.7 A = -10 065 Ì ,31,\ p 132.5 9.0 B = +7.1770 J ( }

/ t° -209.86 Trp. -215.20 A = -6 881.3 \ (2);c/.2 \p 96.4 I 28.82 B = 4-7.665581/ (*o> 35)

Neon (39)

*, °C I Pmm Il *, °C I Pmm

-248.56 317 -253.64 20.0-248.84 279 -254.07 14.9-249.09 250 -254.63 9.8-249.62 195 -254.92 7.8-250.22 148 -255.43 5,1-250.84 111 -255.79 3.7-251.24 91 -256.46 2.1-252.62 40 -256.79 1.3-253.16 28.2 -257.62 0.55-253.30 25.3

t° -70.5 Trp. -78 -101 -127Rn p 500 250* 50* 9*

[| Lit. Q») I (34)

* These pressures probably too high, possibly on account of impurities.

2. Two-Phase, Liquid—VaporArgon (i) A « -9377.0

t, 0C I Pmm B = 6.92387-182.82 1026.0 N (2}

-185.66 (760) -— rLLi-189.19 512.17 Trp. *' ^ I ymm

A = -6826.0 ~188-88 1^1'1B= 6 9605 -193.91 938.6

' -195.78 760.0H2 (3, 11, 28)

-248 50 21QQ 2 löö.^o obi.à^^O.«JU ^itf».^ — 9ftA fiQ 99ft V79K9 ^c coo 7 ^U^.Oy 4£&.ot

— ̂ 0^.40 O4O . / orvO K0 1ork nrv

-252.74 760.0 "^ 1JHV-254.73 397.6 "2°9'86 96'4 Tfp'-256.61 191.9 A = -6407.0-258.46 79.9 B = 7.5777-259.14 51.4 Trp. C = -0.00476

t ï ~!49't? Neon (4' 24> 39)c- o'So ~228'66 19797

D--004Î89 ~229'26 18472

^ - °-°7 , -231.71 13 245£-= °-°*484 -233.60 10 042

Helium (is» 19, 29) -236.82 6 057.2t, °C I ^ -240.25 3 171.5

-268.88 760 -241.77 2264.8-269.20 565 ~243'69 l 434'9

-269.57 359.5 ~245'68 816'2

-269.92 197 ~245'79 791'°-270.85 51 -245'88 767'1-271 61 4 Is -246.66 605.2

971'7, o' -247.33 486.0~J/i' /4: E _947 4Q 451 filogio P = 4.7290 - 7.9780/21 _247's2 410'

- 0.13628/T2 + 4.3634/77 .̂ _24g' 1Q 3?3

Range, 5.19 to 1.4750K -248.'29 350KrC31) -248.51 325.0

-149.9 898.20-152.1 760.0 A = -1615.5-160.3 386.4 B =5.69991-169 Trp. (132.5) C = 0.0111800

O2 (2, 10, 21, 22, 35) A = -17153t, 0C I Pmm B =7.12128

-182.62 786.63 O3 Ozone* (**> 32, 33)-182.95 760.00 t, 0C ±1 | Pmm-186.91 493.30 -193.1 0.01s-192.01 263.19 -183.1 0.1?-195.50 162.15 -173 1 l 'a-201.38 64.01 ^163'.! 6'.87

-204.52 36.11 _153>1 25.4-210.72 9.59 _143 ! 74>6

-218.4 ±2 Trp. ^1331 182 8

A =-8028.1 -123-1 387'7

B = 8.1173 -112-4 76°C = —0.00648 ""^ ^atm* (crî^cal)

Range, -182 to -2110C -182 1.78g/cm3№)

Rn R^0n (9) * Evaluated by C. S. Cragoe.

-38.6 2000 cooperating expert.

-61.8 (760) Xenon (31)-70.5 Trp. 500 Trp. = ca. -14O0C ,

l

II. VAPOR PRESSURES AND ORTHOBARIC DENSITIESABOVE ONE ATMOSPHERE

p = vapor pressure in normal atmospheres.t = temperature, 0C, Leiden scale (v. Vol. I, p. 54).

T = t +273.1°.di (resp. dv) = density of saturated liquid (resp. vapor) in grams

per cm3.dm = y2(di +dv).

All values at the critical point are given in bold-face type.

Argon (i»s, 6, 16) T Iogi0p = -56.605 +Ï^C I ^toT 3.8015T - 0.10458T^ +

_12g 44 47 996 0.003321T3 _ 0.043219T4; for

-125.49 42.457 p > l'-129.83 35.846 t, 0C | di \ dv

-134.72 29.264 , -239.91 0.03102-140.80 22.185 -240.57 0.04316 0.01922-150.57 13.707 -243.03 0.05402 0.01081-161.23 7,4332 -245.73 0.06050 0.00613-185.66 1.0000 -249.89 0.06724 0.00264

logio P = 4.85033 - 634.391 -253.24 0.07134 0.00116*IT + 30 769.09/r* - 1 076 464 -256.75 O 07494 0.00038*/T3; for p > 1. -258.27 0.07631 O.OQQ2Q*

/op i T 1 -j dm = -0.063510 --A-C * ! *! 0.00039402 .̂—122.44 0.53078 * Calculated from equation ot state.

-125.17 0.77289 0.29534 /19 20 29 3«n-135.51 0.97385 0.15994 Helium (19, 20, 29, 36)-150.76 1.13851 0.06785 T, 0K | p, atm.-161.23 1.22414 0.03723* 5.19 2.261-175.39 1.32482 0.01457* 5.16 2.195-183.15 1.37396 0.00801* 4.90 1.749

dm = 0.20956 - 0.0026235*. 4-21 1-QQQ* Calculated from equation of state. logiQ p = l^^2 - 7.9780/T

- 0.13628/ T2 + 4.3634/713

H2 (3, 11, 12, 23, 26) (from critical point to T =t, 0C I p, atm. "" 1.475°).

-239.91 12.80 T, 0K | di \ dv-240.49 11.752 5.19 0.06930-245.68 5.0566 4.71 0.1139 0.02699-248.50 2.8937 4.59 0.1165 0.02389-252.74 1.0000 4.23 0.1253 0.01637

VAPOR PRESSURES OF THE METALS

J. JOHNSTON, F. FENWICK AND H. G. LEOPOLD

The value, for the several metals, of the coefficient A (in kilo joules) and of B (for pressures p in mm of mercury) in the equationlogio P = —52.23 A/T + B, together with the values (calculated from the equation) of the temperatures corresponding to the pres-sures 760, 1, and 0.001 mm Hg. (1) = liquid, (s) = solid.

Helium.—(Continued)

T1 0K I di I dv

4.22 0.1255 0.01618*3.90 0.1311 0.01176*3.30 0.1395 0.006435*2.56 0.1457 0002079*2.37 0.1466 0.001368*2.30 0.1469t 0.001159*2.21 0.14662.10 0.14641.92 0.14621.59 0.14601.20 0.1459 Idm = -0.40263 -

0.0017616*.* Calculated from equation of state,t Maximum.

Kr (31)t, 0C I p, atm.

- 6 2 . 6 5 4 . 2 4- 70 41.12- 90 24.27-110 11.32-130 4.315-150 1.175-151.8 1.000

diat -146° = 2.155.

N2 (2, 7, 17, 27)

I, 0C I p, atm.-147.13 33.490-152.11 25.889-161.31 15.949-173.58 7.3705-182.47 3.7248-195.78 1.0000

logio P = 5.76381 - 853.522IT + 54 372.3/T7* - 1 783 500/T3; for p > 1.

A new series of determina-tions and discussion of allavailable data are given in (38).

*, 0C I di I dv

-147.13 0.31096-148.08 0.4314 0.2000-153.65 0.5332 0.1177-161.20 0.6071 0.06987-173.73 0.6922 0.02962 |

N2.—(Continued]t, 0C di I dv

-182.51 0.7433 0.01576*-195.09 0.8043 0.00498*-208.36 0.8622 0.000868*

dm = 0.022904 - 0.0019577*.* Calculated from equation of state.

Neon (4, 8, is, 24, 25)

t, 0C p, atm.-228.71 26.86-231.71 17.428-236.82 7.970-241.77 2.980-245.92 1.000

T logio P = -84.380 +2.8191077 + 0.0111800772.

\ t, 0G I di I dv~-228.71 0.4835- 230.07 0.74866 0.23935-234.01 0.92803 0.11592-237.04 1.01750 0.06742- 242.96 1.14960 0.02013-247.921 1.23824 0.00534*

dm = -1.154406 -0.00716146*.

* Calculated from equation of state.

Q2 (2, 15, 27)

t, 0C I p, atm.-118.82 49.713-118.88 49.640-125.28 38.571-135.96 24.528-149.25 12.506-154.87 9.096-182.95 1.000

A new series of determina-tions and discussion of allavailable data are given in (38).

t, 0C I di I dv

-118.82 0.4299-120.4 0.6032 0.2701-123.3 0.6779 0.2022-129.9 0.7781 0.1320-140.2 0.8742 0.0805-154.5 0.9758 0.0385

LITERATURE(For a key to the periodicals see end of volume)

(M Born, 8, 69: 473; 22. (2) Cath, 64P, 21: 656; 19. 168, No. 152d. (3)Cath and Onnes, 6Jf, 20: 991, 1155; 18. 168, No. 152a. (4) Cath andOnnes, 6Jf, 20: 1160; 18. 168, No. 152b. <5) Crommelin, 64P, 13: 54; 10.168, No. 115. (6) Crommelin, 64P, 16: 477; 13. 168, No. 138c. (?)Crommelin, 64P1 17: 959; 15. 168, No. 145d. («) Crommelin, 70, 42:814; 23. (9) Gray and Ramsay, 4, 95: 1073; 09.

(10) Holst, 64P, 18: 829; 16. 168, No. 148a. <11) Martinez and Onnes, 18, 6:31; 22. 168, No. 156b. (") Mathias, Crommelin and Onnes, 64P, 23:1175; 22. 34, 172: 261; 21. 168, No. 154b. (13) Mathias. Crommelinand Onnes, 84, 175: 933; 22. 168, No. 162b. (1^) Mathias, Crommelin.Onnes and Swallow, 64V, 34: 334; 25. 168, No. 172b. (1S) Mathias andOnnes, 64P, 13: 939; 11. 168, No. 117. (1S) Mathias, Onnes and Crom-melin, 64P, 15: 667, 960; 13. 168, No. 131a. (l7) Mathias, Onnes andCrommelin, 64P, 17: 953; 15. 168, No. 145c. <18) Onnes, 64P, 13: 1093;11. 168, No. 119. (19) Onnes, 64P, 14: 678; 12. 168, No. 124b.

(20) Onnes and Boks, B60, 215. 168, No. 17Ob. (21) Onnes and Braak, 64P,11: 333; 08. 168, No. 107a. (22) Onnes and Crommelin, 64P, 14: 163; 11.168, No. 121c. <23) Onnes and Crommelin, 64P, 16: 245; 13. 168, No.137a. (24) Onnes and Crommelin, 6Jf, 18: 515; 15. 168, No. 147d.(25) Onnes, Crommelin and Cath, 64P, 19: 1058; 17. 168, No. 151b.(26) Onnes, Crommelin and Cath, 64P, 20: 178; 17. 168, No. 151c. (2?)Onnes, Dorsman and Hoist, 6Jf, 17: 950; 15. 168, No. 145b. <28) Onnesand Keesom, 6Jf, 16: 440; 13. 168, No. 137d. (2») Onnes and Weber,6Jf, 18: 493; 15. 168, No. 147b.

(30) Patterson, Cripps and Gray, 5, 86: 579; 12. C31) Ramsay and Travers, 62,197: 47; 01. (32) Riesenfeld and Beja, 147, 6: No. 7; 23. 93, 132: 179; 24.<33) Riesenfeld and Schwab, 25, 55: 2088; 22. 96, 11: 12; 22. (3*)Rutherford, S, 17: 723; 09. (3S) von Siemens, 8, 42: 871; 13. (3S)Spangenberg, 7, 119: 419; 26. (37) Travers, Senter and Jacquerod,62, 200: 155; 03. (3*) Dodge and Davis, 1, 49: 610; 27. (3»> Crommelinand Gibson, 64V, 36: 173; 27. 168, No. 185b.

O2.—(Continued}t, 0C I di dv

-182.0 1.1415 0.00490*-210.4 1.2746 0.0000865*

dm = 0.1608 - 0.002265*.* Calculated from equation of state.

Rn, Radon (9)t, 0C I p, atm.

+104.4 62.44100 59.4370 37.6740 13.64

+ 10 11.40- 20 5.260- 50. 2.065- 60 1.361- 61.8 1.000

Xenon (3Q, 31)t, 0C I p, atm.

+ 1 6 . 6 5 8 . 2 20.0 41.24

- 20 26.73

Xenon.—(Continued)J1

0G I p, atm.- 4 0 1 5 . 8 5- 60 8.570- 80 4.064-100 1.629-109.1 Ì.OQQ

t, 0G I di I dv

+16.6 1.16416 1.468 0.84415 1.528 0.791

+ 10 1.745 0.602O 1.987 I 0.421

-10 2.169 ! 0.313-20 2.292 ! 0.238-30 2.410 I 0.180-40 2.511 i 0.137-50 2.605 ! 0.108-60 2.699 j 0.079-70 2.792 I 0.048dm = 1.205 - 0.003055*.

Substance

Ag

AlAs

AuBaBiC

Caf

Cd

Col)CrCsCu

FeHg

KMgMnMoNa

Ni||Pb

PtRbSbSiSnSrWTlZn

State

(1)

(D(D

(s)

(D(D(D(D

(D(s)(D(D

(s)(D(D(D(D

(DO)

(D

(s)

(D(D(D(s)(1)(1)(1)(s)(1)(1)(s)(1)(1)(1)(s)(1)(1)(s)

Range coveredby equation, 0C

1650-1950

800- 860

440- 815

2315-2500930-1130

1210-14203880-4430

960-1110500- 700500- 840

320.9- 525

150- 320.923752200200- 350

2100-2310

2220-2450400-1300

-38.87-400

(-80H-38.87)

260- 760900-1070

1510-19001800-2240180- 883

2360525-1325

1425-1765250- 370

1070-13251200-13201950-2270940-1140950-1200

2230-2770600- 985

419.4- 625

250- 419.4

A (kilo-joule)

250

47.1

133

38535o20054o

37o19599.9

111-0.0177I

109.0309

73.4468

30958.7

73.0

84.926o267680103.3

309188.5

48676

189170

32836o12o897118.0

127-0.017^

133

B (forpin mm

Hg)8.762

6.692

lO.Soo

9.85s15.7658.87e9.596

16.2409.6977.897

12.107

8.5647.571

6.94912.344

7.4827.752

10.383

7.18312.993

9.3oo10.8447.553

7.6oo7.827

7.7866.9769.05l5.9509.64s

16.0566.1409.9208.10s

12.184

9.2Oo

0C at which p in mm Hg equals

760 I 1 I 0.001194s (121s) (837)*

18ooCalculated triple point

36.0 atm., 82O0C604.3 (370.2) (230.3)

(261i) (176s) (1292)(1146) (887) (701.1)*(147o) (904) (606.8)(3927) (2666)* (2018)*

(1174) (9I7) (73i)*(122i H (777) 529

767p = 10 5 1

0C = 485 . 3 454 .6 392 . 2(391. 7) t 219.1

(3168) (1859) (1254)*22oo(669.3) 278.6 (112.3)231o (17O7) (132o)

(323s) (1884) (1267)*p = IO4 10s 5 X 10fi

0C = 544.1 84 1 122o356.70 See special table, p. 206

p = 10-9 IO-» IO"7 10~6

0C = -76.4 -65.7 -53.6 -40.4758 344.2 (162.3)

107o (772) (576.O)*1900 (1227)* (861)*

(4l88)t (3003)t (2293)882 441.2 238.1

(3147) (1851) (125O)*

(171s) 98s 636.2

(49oi)t (2987)î (20so)J(696.0) 295.8 (124.8)1327 (81s) (546.O)*

(262o) t 12i9 (719.2)(226o) (15Os) (1282)(1154) (899) (713.4)*(165o) (74s) (412.7)(63s3)t (44so)t (3353)

906

p = 20 10 5 10C = (632.3) 594.1 558.9 487.7

I I (532.0) t I 296.3

Lit.

(22, 23, 24, 2S1 54, 63, 73, 85

88, 90)

(22, 25, 88)

(34)

(20, 21, 29, 30, 34, 38, 40, 47,

66, 68, 73, 81)

(54, 73, 85, 88)

(77)(22, 23, 24, 25, 54, 73, 81)

(1, 14, 15, 45, 46, 55, 56, 57,

69, 84, 92)

(77, 79)

(64)

(4, 5, 18, 32, 36, 54, 59, 73)

(9, 10,13,59)(80)

(22, 25)

(2, 12, 28, 45, 48, 52, 78, 82)

(16, 22, 23, 24, 25, 54, 58, 73,

81,85)

(22, 25, 76)

(3, 6, 7, 9, 10, 12, 19, 26, 31,

32, 33, 36, 37, 41, 43, 44, 49,

60, 61, 62, 65, 67, 73, 82, 83,86, 87, 94)

(65)

(17, 28, 32, 42, 48, 78, 82)

(8 ,22,25,77,88)(22,25,74)

(39,53,54,93)(19, 27, 28, 32, 37, 50, 70, 78,

91)

(75)

(11, 12, 22, 23, 24, 25, 35, 54,

71, 72, 73, 88, 90)

(39, 53, 54)

(12, 28, 42, 78, 82)

(22,25,54,73,81)

(89);C/. (*6)(22, 23, 24, 25, 54, 73, 88)

(77)(20, 47, 88, 90)

(39, 51, 54, 95)

(4,5,12,23,24,32,36,54,59,71, 73)

(9, 10)

( ) Extrapolated beyond experimental range.* Extrapolated below freezing point.t These two curves are mutually inconsistent.Î Extrapolated above melting point.§ These are the only two cases in which the accuracy of the present data seems to justify the use of a curved line. The equations of these curves are

respectively :logiopcd = -Ul X 52.23/T - 1.203 logioT + 12.107

andlogioPZn - -127 X 52.23/r - 1.203 logioT + 12.184

IJ Slope made equal to that of iron.

LITERATURE(For a key to the periodicals see end of volume)

t1) Alterthum, 97, 6: 540; 25. (2) Bartels, 8, 65: 143; 21. (3) Bernhardt, 63,26: 265; 25. (4) Berthelot, 84, 131: 380; 00. (5) Braune, 93, 111: 109; 20.(6) Cailletet, Colardeau and Rivière, 34, 130: 1585; 00. (7) Callendar andGriffiths, 62, 182: 119; 92. (*) Ditte, 34, 73: 108; 71. (9) Egerton, 3, 33:33; 17.

(1°) Egerton, S, 39: 1; 20. C11) Egerton, 5, 103: 469; 23. (12) Egerton, 3, 48:1048; 24. (13) Egerton and Raleigh, 4, 123: 3024; 23. (14) Fajans, 9, 31 :63; 25. (15) Fajans and Rishkevich, 218, 12: 304, 578; 24. (1^) Fèry, 6,29: 428; 03. (") Fiock and Rodebush, 1, 48: 2522; 26. (18) Fogler andRodebush, 1, 45: 2080; 23. (19) Gebhardt, 26, 3: 184; 05.

(*°) Gibson, Diss., Breslau, 1911. (21) Goubau, 34, 158: 121; 14. ^22) Green-wood, o, 82: 396; 09. (23) Greenwood, 5, 8: 483; 10. (24) Greenwood, 7,76: 484; 11. (2S) Greenwood, 9, 18: 319; 12. (26) Haber and Kerschbaum,9, 20: 296; 14. (2*) Haber and Zisc^, 96, 9: 302; 22. (28) Hackspill, 34,154: 877; 12. (2») Heike, 93, 118; 254; 21.

(30) Heike and Leroux, 93, 92: 119; 15. (31) Hertz, 8, 17: 193; 82. (32) Hey-cock and Lamplough, 182, 28: 3; 12. (33) Hill, 2, 20: 259; 22. (34) Horiba,7, 106: 295; 23. (35) Ingold, 4, 121: 2419; 22. (3«) Jenkins, 5, 110: 456;26. (37) Jewett, 3, 4: 546; 02. (38) Jolibois, 34, 152: 1767; 11. (3»)Jones, Langmuir, Dushman and Mackay, O. The General Electric Co.,Schenectady, N. Y.

(40) Jonker, 93, 62: 89; 09. (41) Kahlbaum, 7, 13: 14; 94. (42) Killian,2,27: 578; 26. (43) Knudsen, 8, 29:179; 09. (44) Knudsen, 8, 32: 809; 10.(45) Kohn, 96, 3: 143; 20. (4*) Kohn andGuckel, 96, 27: 305;24. (4^)Krafft and Knocke, 25, 42: 202; 09. t4*) Kröner, 8, 40: 438; 13. (4»)Laby, 3, 16: 789; 08.

(50) Ladenburg and Minkowski, 96, 6: 153; 21. (51) Langmuir, 2t 2: 329; 13.(52) Langmuir and Kingdon, o, 107: 61; 25. (53) Langmuir and Mackay,2, 4: 377; 14. (54) van Liempt, 93, 114: 105; 20. (5S) van Liempt, 93,115: 218; 20. (56) van Liempt, 176, 21: 517; 24. (57) van Liempt, 218,12: 578; 24. (5«) Mack, Osterhof and Kraner, l, 45: 617; 23. (5^) Maier,l, 48: 356; 26.

THE VAPOR PRESSURE OF MERCURY FROM -39 TO +40O0CUnit, mm of Hg = • K 6 o An

t, 0C [I 0° I 1° I 2° I 3° I 4° I 5° I 6° I 7° I 8° I 9°-30 0.05478 0.06415 0.05359 0.05309 0.05266 0.05229 0.05197 0.05169 0.05145 0.05124-20 .O4ISl .0459 .0440 .0423 .0408 .05947 .05828 .05723 .06630 .05549-10 .04606 .04540 .04481 .04428 .04380 .04337 .04298 .04263 .04232 .04205- O .03185 .03166 .03149 .03133 .03H9 .03107 .04954 .04853 .04762 .04680

+ O .03185 .03206 .03228 .03251 .03276 .03304 .03335 .03369 .03406 03446+ 10 .03490 .03537 .03588 .03644 .03706 .03773 .03846 .03925 .001009 .001101

20 .001201 .001309 .001426 .001553 .001691 .001840 .002000 .002173 .002359 -.00256030 .002777 .003010 .003261 .003532 .003823 .004135 .004471 .004832 .005219 .00563440 .006079 .006556 .007067 .007614 .008200 .008827 .009497 .01021 .01098 .0118050 .01267 .01360 .01459 .01565 .01677 .01797 .01925 .02061 .02206 .0236060 .02524 .02698 .02883 .03079 .03287 .03507 .03740 .03988 .04251 .0453070 .04825 .05138 .05469 .05819 .06189 .06580 .06993 .07429 .07889 .0837580 .08880 .09430 .1000 .1060 .1124 .1191 .1261 .1335 .1413 .149590 .1582 .1673 .1769 .1870 .1976 .2086 .2202 .2324 .2453 .2588

100 .2729 .2877 .3032 .3195 .3366 .3544 .3731 .3927 .4132 .4347110 .4572 .4807 .5052 .5308 .5576 .5857 .6150 .6456 .6776 .7109120 .7457 .7820 .8198 .8592 .9004 .9434 .9882 1.035 1.084 1.134130 1.186 1.241 1.298 1.357 1.419 1.484 1.551 1.620 1.692 1.767140 1.845 1.926 2.010 2.097 2.188 2.282 2.379 2.480 2.585 2.694150 2.807 2.924 3.046 3.172 3.303 3.438 3.578 3.723 3.873 4.028160 4.189 4.356 4.528 4.706 4.890 5.080 5.277 5.480 5.689 5.905170 6.128 6.358 6.596 6.842 . 7.095 7.356 7.626 7.905 8.193 8.490180 8.796 9.111 9.436 9.711 10.116 10.472 10.839 11.217 11.607 12.009190 12.423 12.849 13.287 13.738 14.203 14.681 15.173 15.679 16.200 16.736200 17.287 17.854 18.437 19.036 19.652 20.285 20.936 21.605 22.292 22.998210 23.723 24.468 25.233 26.019 26.826 27.654 28.504 29.376 30.271 31.190220 32.133 33.100 34.092 35.110 36.153 37.222 38.318 39.442 40.595 41.777230 42.989 44.231 45.503 46.806 48.141 49.509 50.909 52.343 53.812 55.316240 56.855 58.431 60.044 61.695 63.384 65.113 66.882 68.692 70.543 72.437250 74.375 76.356 78.381 80.451 82.568 84.732 86.944 89.206 91.518 93.881260 96.296 98.763 101,28 103.85 106.48 109.17 111.91 114.71 117.57 120.49270 123.47 126.51 129.62 132.79 136.02 139.34 142.69 146.13 149.64 153.22280 156.87 160.59 164.39 168.26 172.21 176.24 180.34 184.52 188.79 193.14290 197.57 202.09 206.70 211.39 216.17 221.04 226.00 231.06 236.21 241.46300 246.80 252.24 257.78 263.42 269.17 275.02 280.98 287.04 293.21 299.49310 305.89 312.40 319.02 325.76 332.62 339.60 346.70 353.92 361.26 368.73320 376.33 384.06 391.92 399.91 408.04 416.31 424.71 433.25 441.94 450.77330 459.74 468.86 478.13 487.55 497.12 506.85 516.74 526.79 537.00 547.37340 557.90 568.59 579.45 590.48 601.69 613.08 624.64 636.38 648.30 660.40350 672.69 685.17 697.83 710.68 723.73 736.98 750.43 764.08 777.92 791.97360 806.23 820.70 835.38 850.26 865.36 880.68 896.23 912.01 928.02 944.27370 960.66 977.38 994.34 1011.5 1028.9 1046.5 1064.4 1082.5 1100.9 1119.5380 1138.4 1157.6 1177.0 1196.6 1216.6 1236.8 1257.3 1278.1 1299.1 1320.3390 1341.9 1363.9 1386.1 1408.6 1431.3 1454.3 1477.7 1501.3 1525.2 1549.5

pro oo vx KQ n400 1574.1 (For continuation use the equation, logic P — —-—-—m !—h 7.752, valid up to 130O0C)

This section covers the pressure-temperature relations forsystems composed of a single crystalline phase in contact with itsown vapor. In the case of substances which dissociate on vapori-zation the value given is the total pressure. The literature refer-ences given first are to data to which most weight has been given.

»-TABLE, STANDARD ARRANGEMENT (v. p. viii). -0.05223A , _logio Pmm = Tf ~ +B

KevN

y Formula Range, 0C A, joule B Lit.

2 H2O v. p. 210HCl* -158to-110 1958s 8.443o .(«» 32» <5) ; cf.

(20, 52)

HBrf -114 to- 86 22 42o 8.734 (29, 52, 93); cf.(20)

HIJ - 97 to - 51 24 16o 8.259 (29, 52, 93); c/.(92)

8 SO2 - 95 to - 75 3582? 10.59Ie («» 13»14); cf. (»2)SOa 4 crystalline forms (50)H2S -llOto - 831 20 69o 7.880 (52); c/. (93)

SeO2§ t, 0C I p, mm (3«)

72.0 13.43112.5 21.28180.9 39.00213.5 50.12236.9 66.07259.9 109.6289.2 316.2319.9 849.0317.0 760.0

H2Se -78.11 82.5 C1*)-70.27 157.3-70.15 158.1

H2SeO4 25 to 56 82 4Oo 14.130 (38)

t, 0C I p, mm

10 TeH2 ^6O 34 (")-50 79-45.4 102

N2O -144 to -90 2359o 9.579 (13, 14)NO -200 to -161 16423 10.048 (2«, 30); c/. (57,

61)

N2O4U -100 to -40 55160 13.400 (23); c/. (76)- 4 O t O - 10 45440 11.214 (76); c/. (27, 74)

N2O6 - 30to+ 30 57 18o 12.647 (17, 75)NH3f -127 to- 78 3121i 9.9974 (is, 45, 53, 88); c/.

(7, 13, 14, 57)

NOCI p - 55.0 mm at -68.6° (io)NH4Cl** 100 to 400 83 486 10.0164 (*<>, 41, 67, ss, se,

87); c/. (34, 66)

t, 0C I p, mm

3 3 8 . 0 7 6 0427 4 560459 8 360 (67)490 15 200520 26 220

NH4Br 250 to 400 90208 9.9404(41,85)760 mm at 394.2°

NHJft 300 to 400 I 95 730 10.27Oo (41,85)760 mm at 403.5°

NH4HS 6 to 40 I 46 02s 10.75oo (35, 109)760 mm at 32.7°

^y Formula Range, 0C I A, joule j B Lit.

^2 PCl0 t, 0C I p, min "" ""

156.1 562.3 (»S)143.6 354.8136.7 266.1122.2 133.4101.4 37.58

PH4Cl -78.2 10.0 (102)-63.0 39.81-41.1 251.2-26.8 760.0-23.1 1 OOO.o+ 0.9 5 623.0

29.9 38 900.0PH4Br -80 to +40 48 IU 10.956i (43)

760 mm at 38.1°PH4I 10 to 60 I 51854 10.950o(43,85)

760 mm at 62.5°As2O3 100 tO 310 I 111350 12.127 (59, 84) ; c/. (94)

355.8° at 760.0 mmSbCl3 50.3° at 1.1 mm (54)

59.9° at 3.4 mmBiCh 91 to 213 I 13 12s 2.681 (54)

t, 0G I p, mm16 CO -220.6 4 (24 ,33 ,60)

-209.1 50-205.70 111.33

±0.04CO2U -135 to-56.7 26179.8 9.9082 (31, 32, 47, 62,

83, 96); Cf. (33,

P = 760.0 at -78.52° 107, l i e )

logio p - -127y62 + 0.00683sT + 8.307l

(-183° to -135°)CCl4 -70to -50 I 34 608 8.05 (57)

-36.53° at 3.52 mm-27.19° at 6.17 mm . (68)

(CN)2 -72 to -28 32437 9.6539 (63, ios)NH4CN 7 to 17 4148* 9.97s (36)NH2COaNH4 Data conflicting (9, 37)(NH4J2CO3 j (8)

t, 0C I p, mmCNCl -32.69 58.6 (68)

-30.65 60.1-24.7 101.71-11.41 250.67

CNBr -17 to +35 47 05i 10.32s (5)

For other C-compounds, see the <T-table, p. 208

~~Ï8 SiCl4 1.0 mm at -70° ' (ioo) '

t, 0C I p, mmSiH3Cl -125.3 OTo (99)

-119.0 1.0SiH3Br -94.0 2.5 (98)SnCl4 -52 to -38 46 74o 9.824 (57)

t, 0C I p, mmPbCl2 400 0.00174 (22)

425 .0058450 .0178475 .051

VAPOR PRESSURE OF CHEMICAL COMPOUNDS IN THE CRYSTALLINE STATEA. C. EGERTON AND W. EDMONDSON

(«O) Menzies, 1, 41: 1783; 19. (61) Morley, 3, 7: 662; 04. (62) pfaundler, B,63: 36; 97. (63) Piersol, 2, 23: 785; 25. (64) Pilling, 2,18: 362; 21. (65)Poindexter, 2, 26: 859; 25. (66) Preuner and Brockmöller, 7, 81:129; 12.(67) Ramsay and Young, 4, 49: 37; 86. (68) Rassow, 93, 114: 117; 20;(«») Rishkevich, 9, 31: 54; 25.

(70) Rodebush and DeVries, I1 47: 2488; 25. (" ) Rodebush and Dixon, 1, 47 :1036; 25. ^72) Rodebush and Dixon, IB1 26: 851; 25. (73) Ruff and Berg-dahl, 93, 106: 76; 19. (74) Ruff and Bormann, 93, 88: 365; 14. (™) Ruffand Bormann, 93, 88: 386; 14. (76) Ruff and Bormann, 93, 88: 397; 14.(77) Ruff and Hartmann, 93, 133: 29; 24. (78) Ruff and Johannsen, 25,38: 3601 ; 05. ( 7 » ) Ruff and Josephy, 93,103:17 ; 26.

(80) Ruff and Keilig, 93, 88: 410; 14. C*1) Ruff and Mugdan, 93, 117: 147; 21.(82) Scott, 3, 47: 32; 24. (83) Smith and Menzies, 1, 32: 1434; 10. (84)Thiel and Ritter, 93, 132: 125; 23. (»s) Tiede and Birnbräuer, 93, 87: 129;14. (86) Villiers, 6, 30: 588; 13. (87) Volmer and Estermann, 96, 7: 1;21. (88) yon Wartenberg, 93, 56: 320; 07. (89) VOn Wartenber«?, 93, 79:71; 12.

(9O) von Wartenberg, 9, 19: 482; 13. (91) von Wartenberg, 9, 20: 443; 14.(92) Wertenstein and Jedrzejewski, 34, 177: 316; 23. (93) Worthing, 2, 28:190; 26. (94) Young, 4, 59: 629; 9I1, (**\ Zwikker, 208, 5: 249; 25. (96)Ruff and Konschak, 9, 32: 515; 26.

^®y Formula Range, 0C A, joule B Lit.

_ _ t, 0C I p, n ï m ~ ( T T )

850 2.0917 4.0968 10.5995 17.0

HgF2 Data unreliable (7MHg2Cl2 t, 0C I p, mm («*)

90 0.004 I100 0.0089 £110 0.011 §120 0.016 S130 0.0227 S140 0.038150 0.07160 0.15170 0.27180 0.45

HgCl2 60 to 130 8503o 10.888 (*2» 95); c/. (3)130 to 270 78 85o 10.094

HgBr2 111 to 235 79 800 10.181 (42, 9S); c/. (3)HgI2 100 to 250 82340 10.057 (4 2»9 5); cf. (3»1 J >)HgS 760 mm at 580° (2)

31 t, 0C I p, mmCuO 600 1.34X10-7 (55)

800 1.15X10-4950 6.8 XIO-«

CuCl2 487.6 223.9 (54)470.5 128.8407.2 22.39335.2 5.0318.6 3.55

Ag2O 1 435 3.4 (UO)1 316 0.46

AuCl3§§ 100 7.0 («4)138.5 11.0181 61.2202 154.5229 424.2251 808.7

OsO4 -38 to 40.1 56 5oo 10.7100 C1 1 1)FeCl2 700 to 930 135 200 8.33 (54)

t, 0C I p, mmFeCl3 245.0 19.95 (54)

256.0 35.48292.3 316.2

KevN * Formula Range, 0C A, joule B Lit.

Co2(CO)8 15 0.072 mm (*•)49 UF6 O to 69 41 73o 9.521 (72)

t, 0C I p, mmNbF5 184.5 303.1 (73)

191.6 329.7194.5 358.9

BBr3 -50 0.7 (")BN TJ. Vol. IV, p. 84B(CHa)3NH3H Oto 40 53 184 10.172 0«»)AlCl3 70 to 190 l lSooo 16.24 (5*)

82 NaCl 2.4 mm at 746.9° (54)

* Over the range —150 to -1140C, Karwat gives the equation:

log p = - 1^y62 - 2.3577 log T -f 14.57497,

the coefficient of log T being obtained from specific heat measurements at lowtemperatures.

t Henglein gives the equation:

'os, = -P^° +7.5030.

over the range of his measurements from —130 to -950C.Ì Henglein gives the equation:

log p = - ^10496 + 7.5030

§ The results when plotted give an unusual curve.II For amount of dissociation see (76).

1790 OO1 Karwat gives the equation: log p = ~ 1.81630 log T + 14.97593,

the coefficient of log T being obtained from specific heat measurements at lowtemperatures.

** Smith and Calvert give the equation:

log p = - 192^;357 -f 9.778609 log T - 21.21708.

f t Smith and Calvert give the equation:

log p = - 771y591 + 10.04345 log T + 42.69560.

îî Over the range —110 to -8O0C Henning, to express his experimentalresults, gives the equation:

1279 11log p = ~ f- 1.75 log T - 0.00207575T + 5.85242.

The simpler equation:

log p - - ^^- + 9.8318

expresses his experimental results closely.§§ The vapor is strongly dissociated.

(T-TABLE

-0.05223A , _lOgio Pmm = rf, h B

Formula | Name | Range, 0C | A | B | Lit.CPL1 Methane*. -194 to -184 9 896.2 7.6509 (16, 32, 45) ; c/. (33, ei)C2H2 Acetylene -140 to -82 21914 8.933 (13); c/. (106)C2H2O4 Oxalic acid , . 55 to 105 90502.6 12.2229 (11Z)C2H4O2 Acetic acid -35 to 10 41 689 8.502 (57, 79, 113, H4); c/. (49)C6H4BrCl p-Bromochlorobenzene 23 to 63 69 75s 11.629 (^1)C6H4Cl2 p-Dichlorobenzene 30 to 50 72 21s 12.48o (91); cf. (46, 48)C6H6 Benzene -58 to -30 42 904 9.556 (25, 57); cf, (4, 68, H4)

-30 to +5 44 222 9.8460.018 mm at -77.5°

C6Hi2 Cyclohexane -5 to +5 37394 8.594 (11S)C7H6O2 Benzoic acid 60 to 110 63 82o 9.033 (59)Ci0H8 Naphthalene O to 80 71 401 11.450 (i» 4, 78, 104); c/. (70, 90)Ci0Hi6O Camphor O to 180 53 559 8.799 (1^ 65, 94, 105); ̂ (is, 59)Ci4H8O2 Anthraquinone 224 to 286 110 04o 12.305 (58,94)Ci4Hi0 Anthracene 100 to 160 70 39o 8.706 (59)

* Using specific heats at low temperatures, for log T coefficient, Karwat gives:- 554.518

logio Pmm = if 1.0831 logic T + 10.1840

VALUES OF p AND tCH2O2, Formic acid (44)

tt 0C p, mm1 8.82 9.73 10.64 11.65 12.86 14.17 15.58 17.4

C2H4Br2, Ethylene bromide*(M. R, 9.55°) (69)

-28.21 1.51-23.16 1.90-12.30 2.65- 7.18 3.24

O 3.474- 5.62 5.53

6.54 6.16* M. P. of pure C2HjBr2, 7.7°.

C2H9NS, NH3(C2H6)HS (109)5.0 33

13.4 5517.0 7323.2 10931.4 18335.0 22837.2 26440.5 322C3H4, Allylene (51)-110 I IoC3H4, Aliene (")

-146 I IoC3H6O, Acetone (21)-94.8 I 0.017

C3H6O2, Methyl acetate (39)-135 I 0.00354

C4H10O, Ethyl ether (21)-119.8 0.0027-117.3 0.0065

C4H12ClN, Tetramethyl-ammonium chloride (85)231.5 690227.1 567222.5 430213.3 ^ 312202.4 187186.6 108

C4Hi2IN, Tetramethyl-ammönium iodide (8S)

306.2 781303.0 698295.8 547287.4 421276.6 298260.6 166242.6 83

C6H3N3O7, Picric acid («)100.4 I 0.00249

LITERATURE(For a key to the periodicals see end of volume)

C1) Allen, 4, 77: 400, 413; 00. (2) Allen and Crenshaw, 93, 79:125; 12. 12,34: 341; 12. (3) Arctowski, 93, 12: 413; 96. (4) Barker, 7, 71: 235; 10.(5) Baxter, Bezzenberger and Wilson, I1 42: 1386; 20. (6) Bergstrom, 50,26: 358; 22. (7) Brill, S1 21: 170; 06. (8) Briner, 34, 142: 1416; 06. (»)Briner, 42, 4: 276; 06.

(1O) Briner and Pylkoff, 42, 10: 640; 12. (») Bruylants, 186, 1920: 472. («)Bruylants and Dondeyne, 186, 8: 387; 22. (13) Burrell and Robertson, 30,No. 142; 15. (14) Burrell and Robertson, 1, 37: 2691; 15. (ls) Cragoe,Meyers and Taylor, 1, 42: 206; 20. (»«) Crommelin, 64V, 21: 684; 12. (17)Daniels and Bright, 1, 42: 1131; 20. (18) Datin, 6, 5: 218; 16. (19) Ditte,34, 140: 1162; 05.

(20) Drozdowski and Pietrzak, 165, 1913: 219. (21) Drucker, Jiméno andKangro, 7, 90: 513; 15. (22) Eastman and Duschak, 80, No. 220; 19. (23)Egerton, 4, 105: 647; 14. (24> Estreicher and Bobotek, 165, 1913: 451.(2S) Ferche, 8, 44: 265; 91. (26) Goldschmidt, 96, 20: 159; 23. (2?) Guyeand Drouginine, 42, 8: 473; 10. (2«) Ham, Churchill and Ryder, 143,186: 15; 18. (29) Henglein, 96, 18: 64; 23.

(30) Henglein and Krüger, 93,130: 181 ; 23. (^) Henning, 8, 43: 282; 14. (32)Henning and Stock, 96, 4: 226; 21. (33) Homfray, 7, 74: 129; 10. (34)Horstman, 25, 2: 137; 69. (3S) Isambert, 34, 92: 919; 81. (36) Isambert,34, 94: 958; 82. (37) Isambert, 34, 102: 1313; 86. (3*) Jannek and Meyer,93, 83: 51; 13. (3») Jiméno Gii, 132, 12: 469; 14.

(4O) Johnson, 7, 61: 457; 08. (41) Johnson, 7, 65: 36; 09. (42) Johnson, 1, 33:777; 11. C43) Johnson, 1, 34: 877; 12. (44) Kahlbaum, 7, 13: 14; 94. (4S)Karwat, 7, 112: 486; 24. (««) Kruyt, 7, 79: 657; 12. (4?) Kuenen andRobson, 3, 3:149; 02. (4«) Küster, 7, 51: 222; 05. («) Landoli, 13 SuppL,6: 129; 68.

(SO) Le Blanc and Rühle, 221, 74: 106; 22. («) Lespieau, 6, 27: 137; 12. (52)Maass and Mclntosh, 69, 8 IV : 65; 14. (53) McKelvy and Taylor, SlA, 18 :655; 23. (54) Maier, 30, No. 360; 25. (5S) Mack, Osterhof and Kraner,1,45: 617; 23. (56) Mond, Hirtz and Cowap, 4, 97: 798; 10. (57) Mündel,7, 85: 435; 13. (58) Nelson and Senseman, 45, 14: 58; 22. (*») Nieder-schulte, Diss., Erlangen, 1903.

(«0) OIszewski, 34, 99: 706; 84. (*') Olszewski, 34, 100: 940; 85. («2) Onnesand Weber, 6J1P, 16: 215; 13. (63) Perry and Bardwell, 1, 47:2629; 25.(64) Petit, 27, 37: 615; 25. (6S) Ramsay and Young, 62,175:37; 84. (««)Ramsay and Young, 62, 177: 71; 87. («7) Rassow, 93, 114: 117; 20. («*)Regnault, 161, 26: 339; 62. («9) Regnault, 161, 26: 462; 62.

(70) Rolla, 59, 19: 318; 10. 22, 18 H: 365; 09. (^1) Ruff and Bahlau, 25, 51 :1752; 18. (72) Ruff and Heinzelmann, 93, 72: 63; 11. (73) Ruff andSchiller, 93, 72:329; 11. (74) Russ, 7, 82: 217; 13. (75) Russand Pokorny,67, 34: 1027; 13. (76) Scheffer and Treub, 7, 81: 308; 12. (77) Schenk andAlbers, 93, 105: 145; 18. (7«) Schlumberger, 397, 55: 1257; 12. (79)Schmidt, 7, 7:433; 91.

(8°) Sidgwick, 4, 117: 396; 20. (81) Sidgwick and Aldous, 4, 119: 1001; 21.(82) Sidgwick and Rubie, 4, 119: 1013; 21. (»3) Siemens, 8, 42: 871; 13.(84) Smellie, 54, 42: 466T; 23. (*5) Smith and Calvert, 1, 36: 1363; 14.(»«) Smith and Lombard, 1, 37: 38; 15. (87) Smith and Menzies, 1, 32:1448; 10. (88) Smits and Postma, 64P, 17:182; 14. («») SmitsandSchoen-maker, 4, 1926: 1108.

(90) Speranski, 7, 46: 70; 03. (") Speranski, 7, 51: 45; 05. (92) Steele andBagster, 4, 97: 2607; 10. (93) Steele, Mclntosh and Archibald, 7, 56: 129;06. (94) Stelzner, Diss., Erlangen, 1901. (»5) Stelzner and Niederschulte,88, 7: 159; 05. (»«) Stock, Henning and Kuss, 25, 54: 1119; 21. (»7)Stock and Kuss, 25, 47: 3113; 14. (98) Stock and Somieski, 25, 50: 1739;17. (") Stock and Somieski, 25, 52: 695; 19.

(» 00) Stock, Somieski and Wintgen, 25, 50: 1754; 17. ( 1Oi) Stock and Zeidler,25, 54: 531; 21. (1O2) Tammann, B57, p. 289. (103) Terwen, 7, 91: 469;16. (*04) Thomas, 54, 35: 506; 16. (1OS) Vanstone, 4, 97: 429; 10. (1O*)Villard, &$, 120:1262; 95. (1O?) VillardandJarry,S4, 120:1413;95. (!««)Volmer and Kirchhoff, 7, 115: 233; 25. (1OS) Walker and Lumsden, 4, 71:428; 97.

(11O) von Wartenberg, 9, 19: 489; 13. t111) von Wartenberg, 13, 440: 97; 24.(112) Wobbe and Noyes, l, 48: 2856; 26. (113) Young, 4, 59: 903; 91.(114) Young, 117, 12: 374; 10. (11S) Young and Fortey, 4, 75: 873; 99.(il«) Zeleny and Smith, 63, 7: 667; 06.

C6H4Br2, p-Dibromobenzene(46 ,48 ,91)

t, 0C p, mm84.0 7.58669.4 2.6352.8 0.660?32.8 .079421.0 I .0158

C6H4N2O5, 2, 4-Dinitrophenol(8l)

100 I 0.228

C6H6N2O2, p-Nitroaniline (82)100 0.0136

C6H6O2, Hydroquinol (9*)155.0 5.9157.6 7.1164.3 1.0

C7H5ClO2, Chlorobenzoic acid(80)

o- 100 0.1803m- 100.63 .197p- 100 .045

C7H5NO4, p-Nitrobenzoie acid(80)

100 I 0.0096

C7H6O3, Hydroxybenzoic acid(80)

o- 100 0.397w- 101.06 .00149p- 100.91 .00030

C8H8N2O3, Nitroacetanilide(82)

m- 100 0.0042p- 100 .0021

C8H8O2, p-Toluic acid (*0)100 | 0.216

C8H8O3J Hydroxytoluic acid(80)

0-3 100 0.2350-4 100 .1210-5 100 .182w-4 100 .0176p-3 100.17 .00072

C10H18O, Borneol (l 05)154.3 I 114.8129.1 38.9107.1 12.8890.5 5.01279.0 2.455

C13Hi0O, Benzophenone (108)O 2.03X10-5

8 6.94X10-S26 6.859 XlO-*

7.614X10-432 1.418X10-340 3.198X10-3

3.933XIQ"8

For ice and for water below O0C:IQOAp _ 20

p~~ ~ t +273For water above O0C :

100 — = 0.0775 - 3.13 X 10~4J (valid up to t = 4O0C)

and100 — = 0.0652 - 8.75 X 10~5p (valid above 5O0C)

THE VAPOR PRESSURE OF ICEComputed from the equation

944.K ^fVtfilogioP = _f^i^^ + 8 2312 1Og10T

1 - 0.01677006^ + 1.20514 X IQ-5T2 - 6.757169, mm Hg

Based upon the measurements of Weber (2) and Scheel and Heuse (*); see Washburn (3).T = 273.1 + t

-90° to -30°; unit, 0.001 mm Hg

J9 0C j O I 1 I 2 3 I 4 I 5 6 I 7 I 8 I 9-90 0.07o 0.05s 0.04s 0.04o 0.03s 0.02? 0.022 0.01s 0.01s 0.012-80 0.40 0.34 0.29 0.24 0.20 0.17 0.14 0.12 0.10 0.084-70 1.94 1.67 1.43 1.23 1.05 0.90 0.77 0.66 0.56 0.47-60 8.0s 7.03 6.14 5.34 4.64 4.0s 3.4g 3.02 2.61 2.25-50 29.55 26.1 23.0 20.3 17.8 15.7 13.8 12.1 10.6 9.2s-40 96.6 86.2 76.8 68.4 60.9 54.1 48.1 42.6 37.8 33.4-30 285.9 257.5 231.8 208.4 187.3 168.1 150.7 135.1 120.9 108.1

-30° to 0°; mm Hgt, 0C I 0.0 I 0.3 0.2 I 0.3 I 0.4 | 0.5 | 0.6 [ 0.7 | 0.8 | 0.9-29 0.317 0.314 0.311 0.307 0.304 0.301 0.298 0.295 0.292 0.289-28 0.351 0.348 0.344 0.341 0.337 O 334 0.330 0.327 0.324 0.320-27 0.389 0.385 0.381 0.377 0.374 0.370 0.366 0.362 0.359 0.355-26 0.430 0.426 0.422 0.418 0.414 0.409 0.405 0.401 0.397 0.393-25 0.476 0.471 0.467 0.462 0.457 0.453 0.448 0.444 0.439 0.435

-24 0.526 0.520 0.515 0.510 0.505 0.500 0.495 0.490 0.486 0.481-23 0.580 0.574 0.569 0.563 0.558 0.552 0.547 0.541 0.536 0.531-22 0.640 0.633 0.627 0.621 0.615 0.609 0.603 0.597 0.592 0.586-21 0.705 0.698 0.691 0.685 0.678 0.672 0.665 0.659 0.652 0.646-20 0.776 0.769 0.761 0.754 0.747 0.740 0.733 0.726 0.719 0.712

-19 0.854 0.846 0.838 0.830 0.822 0.814 0.806 0.799 0.791 0.783-18 0.939 0.930 0.921. 0.912 0.904 0.895 0.887 0.879 0.870 0.862-17 1.031 1.021 1.012 1.002 0.993 0.984 0.975 0.966 0.956 0.947-16 1.132 1.121 1.111 1.101 1.091 1.080 1.070 1.060 1.051 1.041-15 1.241 1.230 1.219 1.208 1.196 1.186 1.175 1.164 1.153 1.142

THE VAPOR PRESSURES OF ICE AND WATER UP TO 10O0CE. W. WASHBURN

In the following tables, thevalues given are the vaporpressures for the conditionthat the solid or liquid phase isunder its own vapor pressure.If the solid or liquid phase isin contact with the atmosphere,the corresponding vapor pres-sures will be somewhat higher,and can be obtained by addingto the value given in the tablea small increment, Ap, com-puted by means of the followingequations :

Dans les tables suivantes,les valeurs données sont lestensions de vapeur dans lacondition de la phase solideou liquide se trouvant sous lapression de sa propre vapeur.Si la phase liquide ou la phasesolide se trouve en contactavec l'atmosphère, les tensionsde vapeur correspondantes se-ront un peu plus élevées, et ellespeuvent être obtenues en addi-tionnant aux valeurs donnéesdans les tables un petit accrois-sement, Ap, calculé au moyendes équations suivantes:

Die in den folgenden Tafelnangegebenen Werte für dieDampfdrucke gelten für denZustand, dass die feste oderflüssige Phase unter dem ei-genen Dampfdruck steht. Istdie feste oder flüssige Phase mitder Atmosphäre in Verbindung,so werden die entsprechendenDampf drucke etwas höher sein.Man erhält sie, wenn man zudem in der Tafel angegebenenWert das Inkrement Ap addiert,das sich nach den Gleichungenberechnen lässt:

Nelle tabelle seguenti le ten-sioni riportate sono quelle delsolido o del liquido a contatto colsolo vapore proprio. Quandoil solido o il liquido si trovanoin contatto con l'atmosfera, letensioni di vapore corrispondentisono un po'più alte e si pos-sono avere aggiungendo al valoredella tabella, un incremento Ap,calcolato per mezzo della se-guente equazione:

-30° to 0°; mm Hg.-(Continued)I1

0G I 0.0 I 0.1 0.2 0.3 I 0.4 | 0.5 0.6 [ 0.7 | 0.8 | 0.9-14 1.361 1.348 1.336 1.324 1.312 1.300 1.288 1.276 1.264 1.253-13 1.490 1.477 1.464 1.450 1.437 1.424 1.411 1.399 1.386 1.373-12 1.632 1.617 1.602 1.588 1.574 1.559 1.546 1.532 1.518 1.504-11 1.785 1.769 1.753 1.737 1.722 1.707 1.691 1.676 1.661 1.646-10 1.950 1.934 1.916 1.899 1.883 1.866 1.849 1.833 1.817 1.800

-9 2.131 2.112 2.093 2.075 2.057 2.039 2.021 2.003 1.985 1.968-8 2.326 2.306 2.285 2.266 2.246 2.226 2.207 2.187 2.168 2.149-7 2.537 2.515 2.493 2.472 2.450 2.429 2.408 2.387 2.367 2.346-6 2.765 2.742 2.718 2.695 2.672 2.649 2.626 2.603 2.581 2.559-5 3.013 2.987 2.962 2.937 2.912 2.887 2.862 2.838 2.813 2.790

-4 3.280 3.252 3.225 3.198 3.171 3.144 3,117 3.091 3.065 3.039-3 3.568 3.539 3.509 3.480 3.451 3.422 3.393 3.364 3.336 3.308-2 3.880 3.848 3.816 3.785 3.753 3.722 3.691 3.660 3.630 3.599-1 4.217 4.182 4.147 4.113 4.079 4.045 4.012 3.979 3.946 3.913-Q 4.579 4.542 4.504 4.467 4.431 4.395 4.359 4.323 4.287 4.252

THE VAPOR PRESSURE OF LIQUID WATER FROM —16 TO O0C (IN MM HG)Computed from the above table with the aid of the thermodynamic equation

logio^ = 2~3'\4^9* - 1.330 X 10-5*2 + 9.084 X 10̂ (3)

t, 0C I 0.0 I 0.1 I 0.2 I 0.3 I 0.4 I 0.5 | 0.6 | 0.7 | 0.8 | 0.9-15 1.436 1.425 1.414 1.402 1.390 1.379 1.368 1.356 1.345 1.334-14 1.560 1.547 1.534 1.522 1.511 1.497 1.485 1.472 1.460 1.449-13 1.691 1.678 1.665 1.651 1.637 1.624 1.611 1.599 1.585 1.572-12 1.834 1.819 1.804 1.790 1.776 1.761 1.748 1.734 1.720 1.705-11 1.987 1.971 1.955 1.939 1.924 1.909 1.893 1.878 1.863 1.848

-10 2.149 2.134 2.116 2.099 2.084 2.067 2.050 2.034 2.018 2.001-9 2.326 2.307 2.289 2.271 2.254 2.236 2.219 2.201 2.184 2.167-8 2.514 2.495 2.475 2.456 2.437 2.418 2.399 2.380 2.362 2.343-7 2.715 2.695 2.674 2.654 2.633 2.613 2.593 2.572 2.553 2.533-6 2.931 2.909 2.887 2.866 2.843 2.822 2.800 2.778 2.757 2.736

-5 3.163 3.139 3.115 3.092 3.069 3.046 3.022 3.000 2.976 2.955-4 3.410 3.384 3.359 3.334 3.309 3.284 3.259 3.235 3.211 3.187-3 3.673 3.647 3.620 3.593 3.567 3.540 3.514 3.487 3.461 3.436-2 3.956 3.927 3.898 3.871 3.841 3.813 3.785 3.757 3.730 3.702-1 4.258 4.227 4.196 4.165 4.135 4.105 4.075 4.045 4.016 3.986

-O 4.579 4.546 4.513 4.480 4.448 4.416 4.385 4.353 4.320 4.289

THE VAPOR PRESSURE OF LIQUID WATER FROM O0C TO 10O0C (IN MM HG)From the Physikalisch-Technische Reichsanstalt " Wärmetabellen," Holborn, Scheel and Henning, Vieweg und Sohn, Braunschweig,

1909. By permissiont, 0C | 0.0 | 0.1 0.2 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.8 | 0.90 4.579 4.613 4.647 | 4.681 4.715 4.750 4.785 4.820 4.855 4.8901 4.926 4.962 4.998 5.034 5.070 5.107 5.144 5.181 5.219 5.2562 5.294 5.332 5.370 5.408 5.447 5.486 5.525 5.565 5.605 5.6453 5.685 5.725 5.766 5.807 5.848 5.889 5.931 5.973 6.015 6.0584 6.101 6.144 6.187 6.230 6.274 6.318 6.363 6.408 6.453 6.498

5 6.543 6.589 6.635 6.681 6.728 6.775 6.822 6.869 6.917 6.9656 7.013 7.062 7.111 7.160 7.209 7.259 7.309 7.360 7.411 7.4627 7.513 7.565 7.617 7.669 7.722 7.775 7.828 7.882 7.936 7.9908 8.045 8.100 8.155 8.211 8.267 8.323 8.380 8.437 8.494 8.5519 8.609 8.668 8.727 8.786 8.845 8.905 8.965 9.025 9.086 9.147

10 9.209 9.271 9.333 9.395 9.458 9.521 9.585 9.649 9.714 9.77911 9.844 9.910 9.976 10.042 10.109 10.176 10.244 10.312 10.380 10.44912 10.518 10.588 10.658 10.728 10.799 10.870 10.941 11.013 11.085 11.15813 11.231 11.305 11.379 11.453 11.528 11.604 11.680 11.756 11.833 11.91014 11.987 12.065 12.144 12.223 12.302 12.382 12.462 12.543 12.624 12.706

THE VAPOR PRESSURE OF LIQUID WATER FROM O0C TO 10O0C (IN MM HG).—(Continued]t,°C I 0.0 0.1 I 0.2 I 0.3 0.4 0.5 | 0.6 | 0.7 | 0.8 | 0.915 12.788 12.870 12.953 13.037 13.121 13.205 13.290 13.375 13.461 13.54716 13.634 13.721 13.809 13.898 13.987 14.076 14.166 14.256 14.347 14.43817 14.530 14.622 14.715 14.809 14.903 14.997 15.092 15.188 15.284 15.38018 15.477 15.575 15.673 15.772 15.871 15.971 16.071 16.171 16.272 16.37419 16.477 16.581 16.685 16.789 16.894 16.999 17.105 17.212 17.319 17.427

20 17.535 17.644 17.753 17.863 17.974 18.085 18.197 18.309 18.422 18.53621 18.650 18.765 18.880 18.996 19.113 19.231 19.349 19.468 19.587 19.70722 19.827 19.948 20.070 20.193 20.316 20.440 20.565 20.690 20.815 20.94123 21.068 21.196 21.324 21.453 21.583 21.714 21.845 21.977 22.110 22.24324 22.377 22.512 22.648 22.785 22.922 23.060 23.198 23.337 23.476 23.616

25 23.756 23.897 24.039 24.182 24.326 24.471 24.617 24.764 24.912 25.06026 25.209 25.359 25.509 25.660 25.812 25.964 26.117 26.271 26.426 26.58227 26.739 26.897 27.055 27.214 27.374 27.535 27.696 27.858 28.021 28.18528 28.349 28,514 28.680 28.847 29.015 29.184 29.354 29.525 29.697 29.87029 30.043 30.217 30.392 30.568 30.745 30.923 31.102 31.281 31.461 31.642

30 31.824 32.007 32.191 32.376 32.561 32.747 32.934 33.122 33.312 33.50331 33.695 33.888 34.082 34.276 34.471 34.667 34.864 35.062 35.261 35.46232 35.663 35.865 36.068 36.272 36.477 36.683 36.891 37.099 37.308 37.51833 37.729 37.942 38.155 38.369 38.584 38.801 39.018 39.237 39.457 39.677234 39.898 40.121 40.344 40.569 40.796 41.023 41.251 41.480 41.710 41.94

35 42.175 42.409 42.644 42.880 43.117 43.355 43.595 43.836 44.078 44.32036 44.563 44.808 45.054 45.301 45.549 45.799 46.050 46.302 46.556 46.81137 47.067 47.324 47.582 47.841 48.102 48.364 48.627 48.891 49.157 49.42438 49.692 49.961 50.231 50.502 50.774 51.048 51.323 51.600 51.879 52.16039 52.442 52.725 53.009 53.294 53.580 53.867 54.156 54.446 54.737 55.030

40 55.324 55.61 55.91 56.21 56.51 56.81 57.11 57.41 57.72 58.0341 58.34 58.65 58.96 59.27 59.58 59.90 60.22 60.54 60.86 61.1842 61.50 61.82 62.14 62.47 62.80 63.13 63.46 63.79 64.12 64.4643 64.80 65.14 65.48 65.82 66.16 66.51 66.86 67.21 67.56 67.9144 68.26 68.61 68.97 69.33 69.69 70.05 70.41 70.77 71.14 71.51

45 71.88 72.25 72.62 72.99 73.36 73.74 74.12 74.50 74.88 75.2646 75.65 76.04 76.43 76.82 77.21 77.60 78.00 78.40 78.80 79.2047 79.60 80.00 80.41 80.82 81.23 81.64 82.05 82.46 82.87 83.2948 83.71 84.13 84.56 84.99 85.42 85.85 86.28 86.71 87.14 87.5849 88.02 88.46 88.90 89.34 89.79 90.24 90.69 91.14 91.59 92.05

50 92.51 97.20 102.09 107.20 112.51 118.04 123.80 129.82 136.08 142.6060 149.38 156.43 163.77 171.38 179.31 187.54 196.09 204.96 214.17 223.7370 233.7 243.9 254.6 265.7 277.2 289.1 301.4 314.1 327.3 341.080 355.1 369.7 384.9 400.6 416.8 433.6 450.9 468.7 487.1 506.1

90 525.76 527.76 529.77 531.78 533.80 535.82 537.86 539.90 541.95 544.0091 546.05 548.11 550.18 552.26 554.35 556.44 558.53 560.64 562.75 564.8792 566.99 569.12 571.26 573.40 575.55 577.71 579.87 582.04 584.22 586.4193 588.60 590.80 593.00 595.21 597.43 599.66 601.89 604.13 606.38 608.6494 610.90 613.17 615.44 617.72 620.01 622.31 624.61 626.92 629.24 631.57

95 633.90 636.24 638.59 640.94 643.30 645.67 648.05 650.43 652.82 655.2296 657.62 660.03 662.45 664.88 667.31 669.75 672.20 674.66 677.12 679.5997 682.07 684.55 687.04 689.54 692.05 694.57 697.10 699.63 702.17 704.7198 707.27 709.83 712.40 714.98 717.56 720.15 722.75 725.36 727.98 730.6199 733.24 735.88 738.53 741.18 743.85 746.52 749.20 751.89 754.58 757.29100 760.00 762.72 765.45 768.19 770.93 773.68 776.44 779.22 782.00 784.78101* 787.57 790.37 793.18 796.00 798.82 801.66 804.50 807.35 810.21 813.08

*For higher temperatures, D. p. 233.LITERATURE

(For a key to the periodicals see end of volume)(») Scheel and Heuse, 16, 29: 731; 09. (2) Weber, 168, No. 150: 37; 15. (3) Washburn, 406, 52: 488; 24.

VAPOR PRESSURES OF CHEMICAL COMPOUNDS IN THE LIQUID STATE FOR PRES-SURES UP TO TWO ATMOSPHERES

OTTO MAASSIn addition to the vapor-pressure data for the compounds given,

the Ä-Table is a complete index to the vapor-pressure data for allpure chemical compounds in the liquid state. The literaturereferences given first are those upon which the values given arebased; confirmatory references are marked cf.

»-TABLE, STANDARD ARRANGEMENT (v. p. viii). -0.05223A , .,lOgio Pmm — y ' **

The tables contain either the values of A and B in the aboveequation (together with the range of applicability of the equation),tabulated values of t and p, or both.

The values in the B. P. column are based on the best availabledirect determinations of the boiling point. These values notinfrequently differ considerably from those interpolated from thevapor-pressure data, a situation which can be cleared up only byfurther research.

_ , -T. 0_ A, T, Normal T . ,Formula Range. 0C .̂ B B f p ^ c Lit.

H2Q T. p. 210H2Q2 10 to 90 48580 8.853 (**)

HF 77. -83 to +48 ~ 25180 7.37o (<*<>)

ClO2 —59 to -fll 27260 7.89s (29)HCl -85.0 (25); Cf. ( 3 2 , 6 4 )

t, 0C P, mm-108 168.5-104 226.2-100 329.8- 96 503.4- 88 640.8

HBr -86 to -66~ 17960 7.42? (aa);c/. (63 ,64)

HI -50 to -34 21580 7.63o (32); cf. (63)SO2 -10.02 (7> 25, 37)

t, 0C p, mm t, 0C p, mm-70 19.9 -30 286.0-65 30.0 -25 373.0-60 42.8 -20 478.0-55 61.8 -15 607.0-50 86.7 -10 761.0-45 119.6 - 5 947.0-40 162.3 O 1164.0

^_ -35 217.1

SQ3 24 to 48 43450 10.022 ~ "(*)H2S -59.4 (32); cf. (63, 64)

t, 0C P1 mm t, 0C p, mm-82 172 -66 53s-78 23s -62 660-74 339 -58 83o-70 432

S2Ch O to 138 35990 7.45s (23)

SOBr2 l85)H2Se -60 to -26 2021 o 7.43i (")

H2SeO3 70 to 110 43ooo S.lso (27)

SeOCl2 176.4 "(**)t, 0C pt mm t, 0C p, mm

85 22.0 135 213.095 37.4 145 304.0

105 58.9 155 418.0115 94.4 165 560.0125 114.0

H2Te TT -46 to O ~ 227eo 7.26o QQ)

N2Q -90.Ito -88.7 16440 7.5s5~ (12); c/. (7* 46)NO T". -163.7 to -148 1304o 8.440 (*»» 24)

N2Qs ~ -25 to Q 39400 "10.so (22)NaO4 -8 to +43.2 3343o 8.814 (5, 56); c/. (45,

85.5)

-, , T-. nx-i A, _, Normal T . ,Formula Range. 0C .̂ B ^ p>> „c Lit.

H3N... -33.35 (13, 25); c/. (7,t, 0C p, mm *, 0C p, mm 12,43)-77 47.8 -47 365.5-74 60.5 -44 432.9-71 76.7 -41 510.8-68 94.7 -38 598.6-65 117.1 -35 699.1-62 143.8 -32 812.9-59 175.5 -29 941.3-56 212.7 —26 1085.0-53 256.3 -23 124?. o-50 307.0 -20 1427.0

NOCI -61.5 to -"JIT 25500 7.870 (80); c/. (9)

P2O3 tt 0C p, mm t, 0C p, mm (57)30 8 70 6050 9.0 80 15o60 ̂ 2o 90 3Oo

PH3 -87.4 (25); Cf, (64)

t, 0C p, mm t, 0C pt mm-133 29.8 -109 209.9-129 43.0 -105 274.6-125 61.3 -101 354.2-121 85.7 - 97 450.4-117 117.5 - 93 564.5-113 158.8 - 89 699.5

PCl3 0-70 31860 ~~7.6si 73.5 (««)

As2O3 315 to 490 52120 6.51s (ss)

AsCl3 50 to 100 39Ïïô~ 7.95s~ (6)

SbCl3 170 to 253 ~~49440 8.09o (49)<, 0C p, mm120 29130 43140 64150 92160 127

SbBr3 235 to 324 55Ooo 8.00s (49)t, 0C p, mm t, 0C p, mm180 42 210 111190 59 220 148200 82 230 195

SbI3 330 to 445 64150 7.83i (49)t, 0C p, mm t, 0C p, mm250 23 295 80265 35 310 115280 53 325 166

CO -290 to -206 6354 6.976 Q8); cf. (3> 39)

CO2, v. p. 235C3Q2 .TT -100 to +6 25460 ~7.640 6.3 (77)CCl4, see also t, 0C p, mm t, 0C p, mm (16» 84)p. 215 -20 9.9 60 439.0

O 33.1 90 1112+30 139.5 110 1880

CCl2O -15 to +22 25390 7.59o v. p. ( 4M215 _

CS2 46.25 (4> 25, 37, 59 ) ;

/, 0C p, mm tt 0C p, mm cf. (46> 4 7)

-70 1.6 +10 198.1-60 3.5 20 297.5-50 7.1 30 432.7-40 14.0 40 616.7-30 26.2 50 854.0-20 46.5 60 1178.0-10 78.8 70 157o.o

O 127.8COS -80 to -50 19220 7.38s (««)

*, 0C p, mm-130 l.s-110 13.0- 90 73.0

Formula Range, °C ^ B %%£. Lit.

CSSe «, 0C p, mm 84.5 (78)O 2e

+ 15 5s30 11250 24e70 48s

(CN)2 -32 to - 6 23750 7.80s (79)HCN 77. - 8 to +27 2783p 7.744e (42); cf. I87)CNCl - 5 to +40 27100 7.840 (*«)

For other C-compounds, v. thé (T-Table, p. 215SiQ2 1860 to 2230 SOeooo 13.43 22so (52) ~H4Si -160 to -112 12690 6.99e (71); cf. (*)H6Si2. . . . . . . . . -115 to -14.6 217oo 7.25s (Ti)H8Si3 77 -70 to +52 29850 7.67e (7i> 76)(SiHa)2Q _. -110 to -15 23590 7.68e (TS)SiCU -70to +5 30100 7.644 (*«> 75)Si2CIe . 40 to 103 459 o o 8.7oe 139 (33)Si3CIs 77 124 to 149 50500 8.3oo 213 (33)(SiCh)20 30 to 137 398so 7.98o (75)

t, 0C p, mmO 1.5

10 3.020 6^0

SiH3Cl -110 to -30 21400 7.48s (73)SiH2Cl2 -100 to + 8 25500 7.61s (73)SiH3Br - 90 to + 2 244so 7.524 (Ti)SiH2Br2... 77. - 65 to +18 310io 7.654 ^^^ (72)(SiH3)BN..."7. - 60 to +15 30620 7.88s (74)

For methylsilicanes, v. p. 215Ge2H6 .] - 98 to +30 264oo 7.444 Q«)Ge3H8 O to 111 31900 7.224 Q*)GeCl4 10.4 to 86 385oo 7.340 (38)SnH4 —148 to -49 19i40 7.4oo (40)SnCh t, 0C p, mm t, 0C p, mm (84)

-10 2.8 90 360.5+ 10 10.3 120 895.0

30 31.3 140 1497.060 112.0

PbF2 77 1078 to 1289 !65100 8.391 1292 (82)PbCl2 7". 500 to 950 141900 8.961 94s (17); cf. (82)PbBr2 735 to 918 llsooo 8.0e4 9ie (82)TlF 282 to 298 IQsooo 12.52 298 (82)TlCl . 665 to 807 105200 ~7.9?4 8Oe (82)TlBr 634 to 817 105400 7.940 81s (82)TlI 693 to 822 1054oo 7.9o2 824 (82)CdI2 385 to 450 122200 9.269 "(**)HgCl . 383(61); cf. (2» 48)

t, 0C p, mm310 10s.o330 189.2350 329.9370 548.9

HgCl2 77. 275 to 309 61020 8.409 2ZZZZ (28» 44» 6S)HgBr2 238 to 331 612so 8.284 (28, 44, 65)HgI2.... 266 to 360 62770 8.11s (28, 44, es)Cu2Cl2 878 to 1369 80? o o 5.454 13ee (82)Cu2Br2.... 77. 997 to 1351 79900 5.4eo" 1345 (82)Cu2I2 991 to 1154 80700 5.5?o 1293 (82)AgCl 1255 to 1442 ISssoo 8.179 15s4 (82)OsFs 7". 38 to 47.3 292^0" 7.6s(7 (54)Co(CO)3NO... 14 to 66 3021 o 7.3ee (36)Ni(CO)4 2 to 40 29800 7.7so 43 (15); c/. (34)CrQ2Cl2.. . 7". 79 to 116 362so 7.73s 116.7 (35)NbF5 219 7")

t, 0C p, mm182 29o200 42o210 54o

• n i T^ n^ A, T» Normal TFormula Range, 0C . ' B Lit.joule B. F., O

t, 0C p, mm t, 0C p, mmTaF6 182 37o 218 58o (51)

200 4Oo 229 75o

B2H6 -112 to -87 13050 6.5se (66)B5Hn (86)BCl3 +12.7 (70)

t, 0C p, mm-80 4.0-60 Is. o-30 lle.o-15 251.0

O 477.0 (

BBr3 -40 to +90 33320" 7.655 (67)B2H6Br -80to -5 262eo 7.640 (<">)B3N3H6 C8«)

For B(CaHb)x. t>. p. 215Al2Q3 1840 to 2200 54oooo 14.22 22io (52)LiF 1398 to 1666 21s40o 8.7ss 1670 (53); c/. (»3)LiCl TTT 1045 to 1325 155900 7.9s9~ 1387 (so); cf. (83)LiBr 1010 to 1265 1527^00" S.Oes 12es (so); cf. («3)LiI 940 to 1140 148600 8.On llsg (so); c/. (83)NaOH 1010 to 1402 !82000 7.Oso 1390 (8i)NaF 1562 to 1701 2l8200 8.640 17os (S3); cf. (83)NaCl 1156 to 1430 ISssoo 8.548 14s9 (81); c/. (SO)

976 to 1155 180300 8.3297 (*»)NaBr 1138 to 1394 16ieoo 7.948 139s (8M; c/. (so)NaI 1063 to 1307 !65100 8.371 1297 (81)î cf. (so)NaCN 7". 800 to 1360 155520 7.472 1496 (26)KOH 1170 to 1327 13eooo 7.3so 1322 (8MKF 1278 to 1500 2075^0" 9.Ooo~ 1498 TS3)î c/. (83)KCl 1116 to 1418 169700 S.lso 14ie (81); cf. (SO)

906 to 1105 174500 8.3526 (*»)KBr 1095 to 1375 16ssoo 7.9se 13si (81); c/. (50)

906 to 1063 168100 8.2470 Q9)KI 1063 to 1333 155700 7.949 13si (81); c/. (50)

843 to 1028 157600 8.0957 (**>)RbF 1142 to 1400 18s200 8.570 14o8 (S3); c/. (S3)RbCl 1142 to 1395 1986^7 9.1n 13ss (so); c/. (83)RbBr 1050 to 1365 !65000 8.223 1340 (50); cf. (83)RbI 1075 to 1325 ISeeoo 8.067 13o4 (so); cf. (83)CsF 1033 to 1255 14o900 7.7os 12ss (S3); c/. (83)CsCl 986 to 1295 !63200 8.340 1289 (so); c/. (83)CsBr 978 to 1305 15s60o 7.990 ~1297 (50); c/. (83)

CsI 1052 to 1280 185700 9.124 12so (so); c/. (83)

LITERATURE(For a key to the periodicals see end of volume)

(i) Adwentowski and Drozdowski, 180, 1911 A: 330. (2) Arctowski, 93, 12:417; 96. (3) BaIy and Donnan, 4, 81: 907; 02. (4) Battelli, Mem. dellaAccad. di Torino, 41: 1 ; 90. (5) Baume and Robert, 34, 168: 1201 ; 19. («)Baxter, Bezzenberger and Wilson, 1, 42: 1386; 20. (7) Bergström, 50, 26:358, 876; 22. (8) Berthoud, 42, 20: 77; 23. (9) Briner and Pylkoff, 42,10:640; 12.

(i o) Bruylants, 186, 6: 472; 20. (U) Bruylants and Dondeyne, 186, 8: 387; 22.(12) Burrell and Robertson, 1, 37: 2482; 15. (13) Cragoe, Meyers andTaylor, 1, 42: 206 ; 20. ( 14) Dennis, Corey and Moore, 1, 46: 657 ; 24. ( » *)Dewar and Jones, 5, 71: 434; 03. (16) Drucker, Jiméno and Kangro, 7, 90:513; 15. (17) Eastman and Duschak, 30, No. 225: 19. (18) Estreicher andBobotek, 165, 7: 451; 13. (19) Fiock and Rodebush, l, 48: 2522; 26.

(20) Germann and Taylor, 1, 48: 1154; 26. (2M Goldschmidt, 96, 20: 159; 23.(22) Guye and Drouguinine, 42, 8: 473; 10. (23) Harvey and Schuette, 1,48: 2065; 26. (24) Henglein and Krüger, 93, 130: 181; 23. (25) Henningand Stock, 96, 4: 226; 21. (26) Ingold, 4, 123: 885; 23. (27) Jannek andMeyer, 93, 83: 51; 13. (28) Johnson, 1, 33: 771; 11. (29) King andPartington, 4, 1926: 925.

(30) Lenher, Smith and Town, 50, 26: 156; 22. (31) Maass and Hiebert, l, 46:2693; 24. (32) Maass and Mclntosh, 69, 8 III: 65; 14. (33) Martin, 4,105: 2836; 14. (34) Mittasch, 7, 40: 3; 02. (35) Moles and Gomez, 7,80: 513; 12. (36) Mond and Wallis, 4, 121: 32; 22. (37) Mund, 186, 1919:529. (38) Nilson and Petterson, 7, 1: 38; 87. (39) Olszewski, 34, 99: 706;84.

(40) Paneth, Haken and Rabinowitsch, 25, 57: 1891; 24. (^1) Paterno andMazzuchelli, 36, 50 1: 30; 20. (42) Perry and Porter, 1, 48: 299; 26. (*3)Postma, 70, 39: 515; 20. (") Prideaux, 4, 97: 2032; 10. (45) Ramsayand Young, 62, 177: 71; 86. .(46) Regnault, J5J, 26: 339; 62. (47) Rex,7, 06: 358; 06. (48) von Richter, 25, 19: 1057; 86. (49) Rotinyanz andSuchodskii, 7,87:635; 14.

(50) Ruff and Mugdan, S3, 117: 147; 21. (51) Ruff and Schiller; 93, 72: 329;11. (52) Ruff and Schmidt, 93, 117: 172; 21. (53) Ruff, Schmidt andMugdan, 93, 123: 83; 22. (54) Ruff and Tschirch, 25, 46: 929; 13. (55)Rushton and Daniels, 1, 48: 384; 26. (56) Scheffer and Treub, 7, 81: 308; 13.(57) Schenck, Mihr and Bauthien, 25, 39: 1506; 06. (58) Schmidt andWalter, 8, 72: 565; 23. (59) Siemens, 8, 42: 871; 13.

(60) Simons, 1, 46: 2179; 24. («i) Smith and Calvert, 1, 38: 801; 16. (62)Smits and Schoenmaker, 4, 1926:1108. (63) Steele and Bagster, 4, 97: 2607;11. (64) Steele and Mclntosh, 7, 55: 136; 06. (65) Stelzner, Niederschulte

and Priess, 88, 7:159; 06. (66) Stock and Friederici, 25, 46:1959; 13. («*)Stock and Kuss, 25, 47: 3115; 14. (6«) Stock and Kuss, 25, 50: 159; 17.(69) Stock, Kuss and Priess, 25, 47: 3115; 14.

(70) Stock and Priess, 25, 47: 3109; 14. (™) Stock and Somieski, 25, 49 : 111;16. (72) Stock and Somieski, 25, 50: 1739; 17. (73) stock and Somieski,25, 52: 695; 19. (74) Stock and Somieski, 25, 54: 740; 21. (75) Stock,Somieski and Wintgen, 25, 50: 1754; 17. (76) Stock, Stiebeler and Zeidler,25, 56: 1695; 23. (77) Stock and Stolzenberg, 25, 50: 498; 17. (78) Stockand Willfroth, 25, 47: 144; 14. (79) Terwen, 7, 91: 469; 16.

(80) Trautz and Gerwig, 93, 134: 409; 24. (81) Wartenberg and Albrecht,9, 27: 162; 21. (82) Wartenberg and Bosse, 9, 28: 384; 22. (83) Warten-berg and Schulz, 9, 27: 568; 21. (84) Young, 117, 12: 428; 10. (*5)Mayes and Partington, 4,1926: 2594. (85.5) Mittasch, Kuss and Schlueter,93, 159:1; 26. (86) stock and Pohland, 25, 59: 2210; 26. (87) Sinozaki,Kara and Mitsukuri, 505, 6: 157; 26.

C-TABLEThe (T-arrangement, v. p. viii

i 0.05223lOgio Pmm = Ij, A H- r>

The values in the B. P. column are based upon the best avail-able direct determinations of the boiling point. These valuesnot infrequently differ considerably from those interpolated fromthe vapor-pressure data, a situation which can be cleared up onlyby further research.

Range, 0C A, joule B (for Normal(or t, 0C) (or pmm) p in mm) B. P., 0C

CCl2O Carbonyl chloride (3, 76, 78); c/. (80)

-90 to +25 I 24684 | 7.460 | 8.45CCl3NO2 Chloropicrin (5, 124)

-20 1.5 111.91-10 3.0

O 5.7-flO 10.4

20 13.825 18.330 31.135 40.15

CCl4 Carbon tetrachloride (2«, 44, 72, 87, 124, 126, 136)

-70 to -19 36585 8.540 76.75-19 to +20 33 914 8.004

20 9125 114.530 143.035 176.240 215.845 262.550 317.155 379.360 450.865 530.970 622.380 84390 1 122

100 1 463CN4Q8 Tetranitromethane (65)

40 26.6 125.750 44.260 70.6 t,°C ?>mm

70 109 100 33980 164 110 47090 239 120 640

Range, 0C A, joule B (for Normal(or t, 0C) (or pmm) p in mm) B. P., 0C

CHBr3 Bromoform, 9.4 mm at 25.0° (9?)CHCl3 Chloroform (?, 28, 44, 89) ; c/. (87, 126)

-60 0.81 61.20-50 2.06-40 4.7-30 10.0-20 19.6-10 34.75 t, 0C pmm

O 61.0 45 439.0+10 100.5 50 526.0

20 159.6 55 625.225 199.1 60 739.630 246.0 60.9 760.035 301.3 70 1 01940 366.4 80 1 403

HCN Hydrocyanic acid (41); cf. (80, 140)

O to 46 I 27875 | 7.752e j 25.7sCH2Br2 Méthylène bromide (89)

O 11.510 20.420 34.730 56.4

CH2Cl2 Méthylène chloride (89,116)_ _ _

10 229.720 348.930 511.4

CH2O2 Formic Acid (29, 34, 53, 55, 57, 92); c/. (96)

ÏO 18^9 100.520 33.130 52.240 82.650 125.960 189.770 279.680 398.190 552.1

100 753.4CH3AsCl2 Methylarsine dichloride (5)

-17 to +35 I 43686 | 8.6944 [CH3Cl Methyl chloride (47, ioo); c/. (87)

-47 to -10 I 21988 | 7 ASi I -23.47

VAPOR PRESSURES OF ORGANIC LIQUIDSH. R. RAIKES AND E. J. BOWEN