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For that matter, the motion doesn't even need to be
supersonic; I reckon Carl mentioned that just by
way of emphasis. Any reasonably _sudden_ motion of
the piston will launch sound waves which will sooner
or later become thermalized, raising the temperature.
To say the same thing yet another way, the force
required for a sudden movement will be greater than
the force required for a gradual movement. This
means the F dot dx (aka P dV) will be larger than
you might have expected.