Main Question or Discussion Point
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Not as I read the problem... The volume will change in such as a way as to maintain a constant pressure.I don't think that's correct. The example shown days nothing about the outside air. The pressure of the air inside the piston should absolutely change.
Can you elaborate on this?Pressure in the piston will change if the outside pressure changes, but temperature changes won't change anything.
Even far away from a temperature equilibrium the piston will still be in mechanical equilibrium (unless you change the temperature with an explosion...).