A cylinder is vertically placed with its frictionless ,light and moveable piston facing the top. A mass of known value is placed on it, and its distance from the bottom of the cylinder is known. What is the pressure of the gas ?
The Attempt at a Solution
The potential energy of the mass is the work done by the gas. Since the system is in equilibrium , the gas must do work against the compressing effect of the piston.But the problem is there is no change in the volume of the gas.
W=p dV is simply zero since dV is 0 . That doesn't make sense ??