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The potential for a thermodynamic process to be reversed in time. Alternatively, a quantification of how far an irreversible process is from being reversible, which relies on a comparison to a corresponding theoretical reversible process.

2 votes
1 answer
107 views

How to know when a reversible process between end states exists?

I am continuing to try to understand maximum work reversible processes (and a subset thereof -- Carnot cycles) better. I am here curious about the following system. (1) Consider one mole of a gas (sa …
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1 vote
4 answers
247 views

Using quasistatic processes to calculate quantities

This question is inspired by Reif Problem 5.5. Note that it is not a homework problem and, even if it were, my question only loosely relates to it. A vertical cylinder contains $N$ molecules of a mona …
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0 votes
1 answer
159 views

Callen's Maximum Work Theorem: why doesn't heat lost equal heat absorbed (and likewise for w...

This question was, effectively, asked here (please refer to that question for additional context); however, I don't think the given answer is correct (or at least complete) despite my having added a b …
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0 votes
2 answers
73 views

Why the insistence that the process be reversible for $dW_{RWS} = -dF$ to hold (Helmholtz fr...

In a discussion about the (change in the) Helmholtz potential being interpretable as the maximum available amount of work for a system in contact with a thermal reservoir (i.e. the free energy), Calle …
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0 votes
2 answers
179 views

Why is any real process which proceeds through non-equilibrium states necessarily irreversible?

As per the title, why is any real process which proceeds through nonequilibrium states necessarily irreversible? The question came up when reading Callen's definition of "reversible process" (the whol …
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