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Definition of first law of thermodynamics 
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#19
Nov1612, 06:24 PM

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But, I suppose you could adiabatically compress and then allow adiabatic free expansion back to the original volume to reach the final state. There is certainly no reversible adiabatic path between the two states. AM 


#20
Nov1612, 06:34 PM

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The total work is the same in all adiabatic processes between any two equilibrium states having the same kinetic and potential energy.



#21
Nov1812, 03:48 PM

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#22
Nov1812, 05:24 PM

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That does not make it possible for the original system (or impossible either). 


#23
Nov1912, 02:15 AM

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At least stirring is discussed e.g. in Max Planck's Thermodynamik at length as an example of how to do irreversible work and the idea goes back at least to the canon drilling experiments of Lord Rumford.



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