Entropy Change Associated with Work

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Entropy change associated with reversible work is considered zero because it involves only energy changes among microstates without altering their number. McQuarrie's Statistical Mechanics supports this interpretation, emphasizing that reversible work raises or lowers energy levels without affecting the overall microstate count. In contrast, heating a system increases both the number of microstates and the system's entropy. This distinction highlights the difference between work and heat in thermodynamic processes. Understanding these concepts is crucial for accurately analyzing entropy changes in various systems.
Ali Asadullah
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Why entropy change associated with work is zero?
 
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Reversible work, at least. I've seen an interpretation of this in McQuarrie's Statistical Mechanics. He describes reversible work as a raising or lowering of the energy of all the microstates, but not a change in the number of microstates. Thus, the system entropy is unchanged. During heating, however, the number of microstates changes, and so does the system entropy.
 

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