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1. Jun 3, 2016

Undoubtedly0

In Principles of General Thermodynamics, Hatsopoulus and Keenan (p 442) make the following claim:
What, however, would be some physical examples of such a system?

2. Jun 3, 2016

Twigg

A piston with ideal gas as a working fluid in thermal equilibrium with an infinite reservoir. If you do constant pressure compression work on the piston, the gas gets colder, so there's an irreversible flow of heat into the cylinder from the reservoir. The opposite is true if you do expansion work. Either way, doing work on the system results in heat flow in/out of the system in an irreversible manner. The irreversibility is the key to understanding this claim. Remember that thermodynamic equilibrium is a state of maximum entropy.