1. Physical Characteristic of Gases
Chapter 13
Chemistry

2. The Kinetic-Molecular Theory of Matter
The kinetic-molecular theory is based on the idea that particles of matter are always in motion.
The theory is used to explain properties of solids, liquids, and gases.

3. The Kinetic-Molecular Theory of Matter
An ideal gas is an imaginary gas that perfectly fits all the assumptions of the kinetic-molecular theory.

4. The Nature of Gases
Expansion- gases do not have a definite shape or volume
Compressibility- Gases can be forced to fit in a smaller volume
Diffusion- spontaneous mixing of particles.

5. A Real Gas
A Real Gas is a gas that does not behave completely according to the assumptions of the theory

6. Pressure Pressure is defined as force per unit area on a surface.
Pressure = Force
Area

7. Atmospheric Pressure

8. Atmospheric Pressure

9. Measuring pressure
A barometer is a device used to measure atmospheric pressure

10. Units of Pressure
One atmosphere is the average atmospheric pressure at sea level and 0o C.
1 Atm = 760 mmHg
760 torr
101.3 kPa

11. Standard Temperature and Pressure
Standard Temperature and Pressure (STP) are the standard conditions of exactly 1 atm and 0O C.