The discussion focuses on the differences between reversible isothermal expansion and irreversible isothermal expansion in thermodynamics. It highlights that while both processes can have the same initial and final states, the entropy changes differ due to the nature of the processes. The key takeaway is that the work done (W) and heat transfer (Q) are not necessarily the same for both types of expansions, impacting the overall entropy change.
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The answer to your question is covered in my recent Physics Forums Insights article at the following link: https://www.physicsforums.com/insights/reversible-vs-irreversible-gas-compressionexpansion-work/An jinsu said: