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Entropy can be found in an irreversible process, just not directly. Since entropy is a state variable, you can invent a path connecting the initial and final states that does consist of reversible processes and then compute the total equilibrium change for that path.

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Q: Why entropy cannot find during irreversible process?
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Can entropy decrease during a process?

in general entropy will not decrease in a spontaneous process since spontaneous process are all irreversible ones. entropy can be reversed only through an reversible process by an ideal engine but it is impossible to create such an engine by violating second law of thermodynamics. hence entropy cannot be decreased practically


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