ef152-lec-6-4 - Module 6 Lecture 4 Molecular Basis of...

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EF 152 Spring, 2009 Lecture 6-4 1 Module 6, Lecture 4 Molecular Basis of Thermal Physics EF 152 Spring, 2009 Lecture 6-4 2 Module 6, Lecture 4: Average Values in a Gas We will work on a __________ basis, or use ______ values. Average will be denoted by: Internal energy consists mainly of: = = 2 2 1 v m N KE N U For N molecules: Use the average of the square of the velocity, not the square of the average velocity, or even the square of the average speed. v 1 = -2 v 2 = 4 A. 1 B. 3 C. 9 D. 10 = = = = 2 2 v v v v EF 152 Spring, 2009 Lecture 6-4 3 Average Values in a Gas Since there is no preferred direction of motion: Combining with: = 2 2 1 v m N U 2 2 2 2 2 2 2 z y x z y x v v v v v v v + + = + + = or = 2 2 3 x v m N U EF 152 Spring, 2009 Lecture 6-4 4 Pressure (from a microscopic viewpoint) Pressure: arises from collisions of molecules of gas with walls of container k v j v i v v z y x i ˆ ˆ ˆ + + = = Δ P Orient wall parallel to y-z plane. Collision changes x velocity.
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