18_ChapSummary - SUMMARY The goal of Chapter 18 has been to...

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SUMMARY The goal of Chapter 18 has been to understand the properties of a macroscopic system in terms of the microscopic behavior of its molecules. General Principles The Equipartition Theorem Tells us how collisions distribute the energy in the system. The energy stored in each mode of the system (each degree of freedom ) is or, in terms of moles, 1 2 nRT . 1 2 Nk B T The Second Law of Thermodynamics Tells us how collisions move a system toward equilibrium. The entropy of an isolated system can only increase or, in equilibrium, stay the same. Order turns into disorder and randomness. Systems run down. Heat energy is transferred spontaneously from a hotter to a colder system, never from colder to hotter. Kinetic theory, the micro/macro connection, relates the macroscopic properties of a system to the motion and collisions of its atoms and molecules. Important Concepts Pressure is due to the force of the molecules colliding with the walls: p 5 1 3 N V mv rms 2 5 2 3 N V
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This note was uploaded on 09/26/2010 for the course PHYS 021 taught by Professor Dick during the Spring '08 term at GWU.

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