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4/30– Laurence, Zac, Eric 5/2 -- Kristen, Audrey, Griffin 09/05/2022 PHY 341/641 Spring 2012 -- Lecture 36 2 Fundamental principles of thermodynamics and statistical mechanics • This course focused on “thermostatics” and statistical mechanics of systems in equilibrium • Thermal equilibrium fixed temperature • First law of thermodynamics E E E QW 2 1 For heat added TO the system: Q 0 For heat withdrawn FROM the system: Q 0 For work done TO the system (contraction): W 0 For work done BY the system (expansion): W 0 09/05/2022 PHY 341/641 Spring 2012 -- Lecture 36 3 Thermodynamic process -- WORK various sign conventions !!!#$#!!! Sign convention in your text -- work ON the system; system expands W 0: dW FdxPAdx PdV V W 2P(T,V)dV 12 V 1 09/05/2022 PHY 341/641 Spring 2012 -- Lecture 36 4 First law of thermodynamics E E EQW 2 1 Q heat added TO the system W work done ON the system Q W System of study Controlling medium 09/05/2022 PHY 341/641 Spring 2012 -- Lecture 36 5 Fundamental principles of thermodynamics and statistical mechanics -- continued • From the analysis of the Carnot cycle, a new state variable – S = entropy was analyzed. For a “reversible” process this is defined by: dQ dS T • In terms of S, the differential form of the first law of thermodynamics becomes dEdQdW TdS PdV 09/05/2022 PHY 341/641 Spring 2012 -- Lecture 36 6
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