gases. copyright © houghton mifflin company.all rights reserved. 12–2 a skydiver leaps into the...

Copyright © Houghton Mifflin Company.All rights reserved. 12–2

A skydiver leaps into the earth's atmosphere, which is composed of a mixture of gases.

Source: Brian Erler/Taxi/Getty Images

Steve Fossett flies his balloon Solo Spirit, over the east coast of Australia during his attempt to make the first solo balloon flight around the world.

Source: AP Photo/Steve Holland


Figure 12.1: The pressure exerted by the gases in the atmosphere can be demonstrated by boiling water in a can.

Figure 12.2: When a glass tube is filled with mercury and inverted in a dish of mercury at sea level, the mercury flows out of the tube until a column approximately 760 mm high remains.


Figure 12.3: A device (called a manometer) for measuring the pressure of a gas in a container.

Checking the air pressure in a tire.

Figure 12.4: A J-tube similar to the one used by Boyle.

Figure 12.5: A plot of P versus V from Boyle’s data in Table 12.1.


Figure 12.6: Illustration of Boyle’s law.


Neon signs in Hong Kong

Source: Dave Jacobs/Stone/Getty Images

Figure 12.7: Plots of V (L) versus T (°C) for several gases.

Figure 12.8: Plots of V versus T as in Figure 12.7, except that here the Kelvin scale is used for temperature.

The air in a balloon expands when it is heated. This means that some of the air escapes from the balloon, lowering the air density inside and thus making the balloon buoyant.

Source: John A. Rizzo/PhotoDisc/Getty Images


Researchers take samples from a steaming volcanic vent at Mount Baker in Washington.

Source: USGA Photo by T. Casadevall


Figure 12.9: The relationship between volume V and number of moles n. As the number of moles is increased from 1 to 2 (a to b), the volume doubles.

Popcorn popping.


Figure 12.10: When two gases are present, the total pressure is the sum of the partial pressures of the gases.


Figure 12.11: The total pressure of a mixture of gases depends on the number of moles of gas particles (atoms or molecules) present,

not on the identities of the particles.


Divers use a mixture of oxygen and helium in their breathing tanks when diving to depths greater than 150 feet.

Source: Kurt Amsler/Vandystadt/Allsport/Getty Images


Figure 12.12: The production of oxygen by thermal decomposition of KClO3.


Figure 12.13: (a) A gas confined in a cylinder with a movable piston. (b) The temperature of the gas is increased at constant pressure Pext .

gases. copyright © houghton mifflin company.all rights reserved. 12–2 a skydiver leaps into the...

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air pressure

mixture of gases

total pressure

volume v

plots of v

balloon buoyant

number of moles

balloon solo spirit