thermal properties of matter. temperature measurement thermometric properties = properties changing...
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Thermal properties of matter
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Temperature measurement
• Thermometric properties = Properties changing with temperature– Color– Volume– Length– Electric resistance
• thermistor
– Electric voltage• thermocouple
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Reading Assignment 17.1
You put a thermometer in a pot of hot water and record the reading. What temperature have you recorded?
A. The temperature of the water
B. The temperature of the thermometer
C. An equal average of the temperature of the water and thermometer
D. An average between water and thermometer, shifted more toward water
E. An average between water and thermometer, shifted more toward the thermometer
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Celsius scale
Ice water Boiling water
0°C
100°C
0°C
Thermal equilibrium
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Fahrenheit scale
Salt/ water/ ice mixture
Arm pit
0°F= -17.8°C
96°F
0°C
Recalibration:32 F = 0 C212 F = 100 C
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Thermodynamic temperature
pressure versus temperature for a gas in closed volume
-50
-30
-10
10
30
50
70
90
110
130
-300 -200 -100 0 100
temperature (C)
pre
ssu
re (
kPa
) -273.15 C
P, T
T
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Temperature transformations
Umm Weather Station
Maximum temperature in March: 50.3 F
Minimum temperature in March: -13.9 F
-20
-10
0
10
20
30
40
50
60
3/1 3/3 3/5 3/7 3/9 3/11 3/13 3/15 3/17 3/19 3/21 3/23 3/25 3/27 3/29 3/31
-20
-10
0
10
20
30
40
50
60
dew point
temperature
Express those temperatures in Celsius and Kelvin.
Express the temperature difference in C, F, and K.
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A 30-cm square rubber sheet with handle:
What is the force of air pressure pushing it to the table?
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The density of copper is 8.2 g/cm3.
Find
A. The number of atoms in one cubic centimeter of copper.
B. The average distance between the atoms.
Repeat for silver (density 10.49 g/cm3).
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Linear thermal expansion
T0, L0
L
T, L
oL T T
0L L 0 0L L T T
1611 10 osteel C
1612 10 oconcrete C
See table 12.2
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Pontchartrain Causeway
Lake Pontchartrain is a large shallow brackish lake bordering New Orleans to the north. A 23-mile causeway bridge is leading over the lake.
The temperatures in winter drop to about 35F, while in summer the surface temperature of the bridge easily surpasses 120F.
Estimate the length difference of this concrete causeway between winter and summer.
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Volume expansion
0 0V V T T
0 0 0L L L T T
Relation between volume expansion coefficient and linear expansion coefficient?
3
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Causes of thermal expansion?
x
Potential energy of bond
Distance between two particles
Spring-like bonds
Equilibrium distance
Realistic bonds
Equilibrium distance
Asymmetric binding energyresults in thermal expansion of solids
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Behavior of gases
Consider a cylinder filled with air. A piston is slowly being pushed to the left.
Assume, the gas is in thermal equilibrium with its surroundings.
When the volume of gas will become smaller, will the pressure1 increase?2 decrease?
3 stay the same?
290 K 290 K pV constBoyle’s Law
Isothermal process
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Behavior of gases
Consider the same cylinder.The piston is free to move without friction (p=const).
A flame is slowly heating the air inside.When the temperature of the air increases, will the volume
1 increase?2 decrease?
3 stay the same?
P=1atmP=1atm .
Vconst
T
Charles’ Law
Isobaric process
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Behavior of gases
Consider the same cylinder.The piston is fixed (V=const).
A flame is slowly heating the air inside.When the temperature of the air increases, will the pressure
1 increase?2 decrease?
3 stay the same?
pconst
T
Gay-Lussac’s Law
Isochoric process
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Ideal gas law
pV nRT
8.314J
Rmol K
How many kg of air would we find in the auditorium at this time?
D=1.23 kg/m3
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Phase diagrams of the ideal gas0
.00
.51
.01
.52
.0
0
50
10
0
15
0
molar volume (L/mol)
pre
ssu
re (
atm
)
200 K
500 K
800 K
0.0
0.5
1.0
1.5
2.0
0 200 400 600 800temperature (K)
pre
ssu
re (
atm
)
1000L/mol100L/mol50L/mol
0
50
100
150
0 200 400 600 800temperature (k)
mo
lar
volu
me
(L
/mo
l)
0.5 atm1 atm1.5 atm