# lec9 - MIT OpenCourseWare http/ocw.mit.edu 8.044...

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MIT OpenCourseWare http://ocw.mit.edu 8.044 Statistical Physics I Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

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Some terms that must be understood Microscopic Variable Macroscopic Variable 8.044 L9B1
± Extensive ( N ) Intensive (= f ( N )) V volume A area L length P polarization M magnetization P pressure S surface tension F tension E electric ﬁeld H magnetic ﬁeld ········· ········· T temperature U internal energy 8.044 L9B2

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Adiabatic Walls Diathermic Walls Equilibrium Steady State Complete Speciﬁcation: Independent and Dependent Variables 8.044 L9B3
Equation of State PV = NkT V = V 0 (1 + αT −K T P ) M = cH/ ( T T 0 ) T> T 0 In Equilibrium with Each Other 8.044 L9B4

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OBSERVATIONAL FACTS "0 th Law" equilibrium if A C and B equilibrium then A B C equilibrium 8.044 L9B5
" Law 0.5 ? " Many macroscopic states of B can be in equilibrium with a given state of A Y A Y B A B 1 1 Y B = f (X B ) also X A , Y A X A X B 8.044 L9B6

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THEOREM A "predictor" of equilibrium h(X, Y, . ..) exists
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lec9 - MIT OpenCourseWare http/ocw.mit.edu 8.044...

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