Entropy Change Associated with Work

[Ali Asadullah]

Why entropy change associated with work is zero?

 

[Drakkith]

You sure that's correct?

 

[Mapes]

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.