lec15 - 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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Microcanonical: E fixed + equal a priori probabilities microscopic probability densities [S.M.] Together with the definition of entropy temperature scale and 2 ND law inequalities [Ther- modynamics] 8.044 L15B1
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S 0 ( 3 4 · 7) · 2 ND Law d dS 1 /Q 1 (3 6 · 5) T · Quasi-static means arbitrarily close to equilibrium. Necessary for work differentials to apply Required for = in above 2 ND law relations 8.044 L15B2
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± ² 7. Entropy as a Thermodynamic Variable ∂S 1 /W =0 T gives us T ∂E d Other derivatives give other thermodynamic variables. PdV d /W = S dA X i dx i + HdM + E d P + ··· i F dL 8.044 L15B3
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We chose to use the extensive external variables (a complete set) as the constraints on Ω. Thus
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lec15 - MIT OpenCourseWare http:/ocw.mit.edu 8.044...

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