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by throwawayhehexD » Sun Nov 06, 2016 12:09 pm
So for irreversible adiabatic, PV=constant. For reversible adiabatic, PV^gamma=constant.
The GRE doesn't specify, but I do believe that almost all of the time they mean "reversible adiabatic" when they say "adiabatic". In my opinion, it's sloppy and they really should add "reversible" but they don't and that's just how it is.
So when you read "adiabatic", just assume they mean "reversible adiabatic" unless they tell you some other stuff that signals that they mean irreversible.