chapter14_section01.pps

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14.1

Properties of Gases

In organized soccer, a ball that is properly inflated will rebound faster and travel farther than a ball that is under-inflated. If the

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Properties of Gases >

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14.1 Compressibility

Compressibility

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Compressibility is a measure of how much

the volume of matter decreases under

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Gases are easily compressed

because of the space between the particles in a gas.

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The distance between particles in a gas is much greater than the distance between particles in a liquid or solid.

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14.1 Factors Affecting Gas Pressure

Factors Affecting Gas Pressure

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The amount of gas, volume, and

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Four variables are generally used to describe a gas. The variables and their common units are

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pressure (P) in kilopascals

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volume (V) in liters

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temperature (T) in kelvins

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Amount of Gas

You can use kinetic theory to predict and

explain how gases will respond to a change of conditions. If you inflate an air raft, for

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If the gas pressure increases until it exceeds the strength of an enclosed, rigid container,

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Volume

You can raise the pressure exerted by a contained gas by reducing its volume. The more a gas is compressed, the greater is the pressure that the gas exerts inside the

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Temperature

An increase in the temperature of an enclosed gas causes an increase in its pressure.

As a gas is heated, the average kinetic

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When the Kelvin temperature of the

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Section Quiz

-or-Continue to: Launch:

Assess students’ understanding of the concepts in Section

14.1 Section Quiz.

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1. Compared to liquids and solids, gases are

easily compressed because the particles in a gas

a. attract each other.

b. are spaced relatively far apart.

c. are very small.

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2. Gas pressure is affected by

a. temperature, volume, and the amount of the gas.

b. temperature, volume, and the molar mass of the gas.

c. phase diagram, volume, and the size of the container.

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3. For gases, the SI units for volume (V), pressure (P), and temperature (T) are, respectively,

a. liters, kilopascals, and °C.

b. liters, kilopascals, and kelvins.

c. cm3, kilopascals, and kelvins.

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