ch2.1 - Microstates Macrostates and Multiplicity Two-State...

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Microstates, Macrostates, and Multiplicity Two-State Systems PHYS 4050: Thermodynamics and Statistical Physics Prof. B. A. Foreman
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Motivation • Why does heat always flow from hot objects to cold objects? • The ultimate reason is that this is the most probable direction of energy transfer • Heat energy could flow from cold to hot, but this is very unlikely • To see how unlikely it is, we need to learn how to assign probabilities to the various possible outcomes • This is the foundation for 3 of the 4 laws of thermodynamics • The first step is to count the possible outcomes
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