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Syndy
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I think they mean the pressure after a new equilibrium was found.The pressure of the air inside the piston should absolutely change.
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.
I think they mean the pressure after a new equilibrium was found.
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...).