Entropy change of an irreversible process

AI Thread Summary
In classical thermodynamics, the entropy change for an irreversible process in a closed system is always greater than zero, while it is zero for a reversible process. The discussion highlights a common misconception regarding entropy changes in closed systems during irreversible processes. Clarifications were made regarding the conditions under which entropy can remain constant. The importance of accurately understanding these principles is emphasized, especially in the context of thermodynamic processes. Overall, the consensus is that entropy change cannot be zero in irreversible processes within closed systems.
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Can entropy change be zero for a closed system in an irreversible process? If yes under what conditions? Thanks!
 
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As far as classical thermodynamics is concerned, the entropy change will always be zero for an irreversible process in a closed system.
 
I am shocked!

While browsing through some old posts, I stumbled upon this, and I got a terrible shock. :eek: I had made a typo and nobody had commented on it. My apologies to the OP. What I had meant to write was:

As far as classical thermodynamics is concerned, the entropy change will always be greater than zero for an irreversible process in a closed system, and zero for a reversible process in a closed system.
 

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