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In the expression for entropy we write : delta S = q/T. But it is also mentioned that the process in which heat is added is reversible. Why should the process be reversible?

Physics
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I don;t know/remember the exact and proper reasoning for this. But I'll find out soon and tell you . :)
@Vincent-Lyon.Fr

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Other answers:

Actually, it is dS = dq/T (dS and dq are infinitesimal) If the process is not reversible, unfortunately, dS > dq/T, but we do not know by how much.

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