A piston-cylinder device contains liquid and vapor water in equilibrium at a pressure of 14.7 psia. The mass of the piston is 50 lbm and its diameter is 3 in. Initially the piston sits on some stops and the atmospheric pressure is 14.7 psia. Heat is added to the piston-cylinder device causing the pressure to increase.
Find the pressure at which the piston will just start to lift off the stops. Plot the p-v diagram of the processes.