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Shweta Thakur posted an Question
September 29, 2020 • 21:55 pm 30 points
  • IIT JAM
  • Chemistry (CY)

I am not getting why entropy is defined for reversible isothermal

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    Priyanshu kumar Best Answer

    Entropy is defined for both reversible and irreversible processes. Entropy is a property of the system so it's value is independent of the path followed i.e. It is a point function. So it is defined for both reversible and irreversible processes. When we calculate entropy for any process we consider that process to be reversible cause at the end Entropy is a point function. For reversible process change in entropy of the system and surrounding(Universe) combined is zero. For irreversible process, it is non zero positive that's entropy generation. And for impossible processes, it's negative (refer to Clausius inequality). But calculating absolute entropy is impossible but not necessary too. So we calculate the change in entropy during the process.

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