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What is reversible heat?

Physics Asked on July 15, 2021

If found the following question while studying thermodynamics.

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What is meant by “reversible heat” and when would it be a thermodynamic property (and when it wouldn’t). I am not asking for the solution. I’d like to know what is being asked.

One Answer

You should provide the definition of $Q_R$.

From what I read, reversible heat seems to mean $TdS$. Thermodynamic property probably means "differential of a state variable" or equivalently "exact differntial". If so, the question is just maths. It's about proving the differential $TdS$ is not exact.

Note : "reversible heat" is an extremely confusing expression about $TdS$ imo.

Answered by Benoit on July 15, 2021

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