Consider a thermally conducting cylinder with one end open and other end closed but having a small hole on it. Now, if a piston is held at some distance from the closed end, will it be able to remain at rest, ie attain an equilibrium.
I learnt that the air from the hole enters the cylinder, hence creating a pressure equal to the atmospheric pressure in the volume enclosed by the closed end and piston. So shouldn't the pressure forces on either side of the piston cancel out hence making the piston fall due to its own weight? (Assuming no frictional effects)
Am I missing something?