Chapter 2

Warm-Up

• On the next left page, reflect on the following:• Glass is an amorphous solid. How can you

use that information to help explain why a glassblower can bend and shape a piece of glass that has been heated?

Today’s Topic & Question

• Topic: Behavior of Gases

• How are volume, temperature, and pressure of a gas related?

Measuring Gases

• Gases are able to easily compress

• In a helium tank, the amount of helium you get actually depends on the temperature and air pressure that day!

Volume

• Amount of space matter fills

• Volume of a gas = volume of the container

QuickTime™ and a decompressor

are needed to see this picture.

Temperature

• Measure of the average energy of motion of the particles in a substance

• Fast particles = greater energy = higher temp.

Pressure

• Force of its outward push on the walls of the container

• Measured in kilopascals (kPa)

• Force divided by area

Question for You

• What are 3 properties of a gas you can measure?

Relating Pressure & Volume• Boyle’s Law

• When the pressure of a gas increases, its volume decreases. When the pressure of a gas decreases, its volume increases.

QuickTime™ and a decompressor

are needed to see this picture.

Relating Pressure & Temperature

• When the temperature of a gas increases, its pressure increases.

• When the temperature of a gas decreases, its pressure decreases.

• Page 53 Figure 13

Relating Volume and Temperature

• Charles’s Law• When the temperature of a gas increases,

the volume increases.• When the temperature of a gas decreases,

the volume decreases.