Ch21 - The Big Ideas-Chapter 21(Serway and Beichner Physics for Scientists and Engineers 5th Edition Section 1 The ideal gas law is the natural

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
The Big Ideas—Chapter 21 (Serway and Beichner, Physics for Scientists and Engineers, 5 th Edition) AJM:2/17/01 1 Section 1 The ideal gas law is the natural result of a very simple model of a gas (in which molecules behave like particles that undergo elastic contact collisions with walls and other molecules) and an interpretation of temperature as a measure of the average energy per molecule. In this model the pressure arises from the average force of the collisions between the molecules and the walls and is directly associated with the density and the average translational kinetic energy of the molecules. The ideal gas law then reveals temperature as a pure function of the average translational kinetic energy. With far more generality than is implied by the derivation of this simple model, the “equipartition theorem” says that, for a system in thermal equilibrium, every possible way in which a molecule can store energy (each so-called “degree of freedom”) will on average store an energy determined solely by the temperature. P simple model = 2 3 N V 1 2 mv 2 ( 29 T ideal gas = 2 3 k B 1 2 mv 2 ( 29 1 2 mv 2 = 3 2 k B T Energy per degreee of freedom = 1 2 k B T Section 2 The equipartition theorem allows us easily to determine the internal energy of an ideal gas since the value depends only on how many molecules there are and on how many ways each molecules can translate, rotate and/or vibrate.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/16/2008 for the course PHYSICS 132 taught by Professor Idontknow during the Spring '08 term at Cal Poly Pomona.

Page1 / 3

Ch21 - The Big Ideas-Chapter 21(Serway and Beichner Physics for Scientists and Engineers 5th Edition Section 1 The ideal gas law is the natural

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online