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entropy

# entropy - Entropy and the end of it all In thermodynamics...

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Entropy and the end of it all In thermodynamics entropy was defined as, S dQ/T rev Consider now several examples of how to use this definition to find entropy changes in systems. For a phase transition, S = mL/T c , where T c is the (absolute) temperature for the phase transition and L is the heat of transition.

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To take another example, we show in class for an ideal gas undergoing a reversible process from state i to state f (use the above definition, the ideal gas law, dE int and the first law of thermodynamics): S = nc V ln(T f /T i ) + nRln(V f /V i ). Thermodynamics also gives us a statement of the second law, S isolated > 0. However, you have no doubt heard that entropy is a measure of the disorder or randomness of a system. The above thermodynamic definition of entropy seems far removed from entropy as randomness. We will now relate entropy to the disorder of a system using ideas from statistical mechanics.
Statistical mechanics is a deeper look into the thermal

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entropy - Entropy and the end of it all In thermodynamics...

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