Presentation on theme: "4 Postulates of Kinetic Theory 1) Spherical molecules in constant, random straight-line motion 2) “Elastic” collisions 3) Point masses 4) No interactions."— Presentation transcript:
4 Postulates of Kinetic Theory 1) Spherical molecules in constant, random straight-line motion 2) “Elastic” collisions 3) Point masses 4) No interactions
Ideal Gas Gas that obeys all 4 assumptions of the kinetic theory all of the time. It doesn’t exist. It’s a model.
Real Gas Most real gases obey the kinetic theory most of the time.
Which assumptions of the kinetic theory hold up? 1. Spherical molecules in random, straight-line motion 2. “Elastic” collisions
Which assumptions of the kinetic theory break down? 1. Point masses 2. No interactions
When do the assumptions of the kinetic theory break down? When the gas molecules are close to each other.
When are the gas molecules close to each other? At high pressure & low temperature.
When are the gas molecules far apart from each other? At low pressure & high temperature.
How do the gas molecules act when they are far apart from each other? Good!
What are the properties of gases? 1. Have mass 2. Take the shape & volume of their container 3. Compressible 4. Diffuse (spread spontaneously) 5. Exert Pressure
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