Task id12380

A cylindrical vessel containing unsaturated steam is closed by a heavy piston that fits tightly to the walls of the vessel and can move freely along the vessel. The vessel is slowly cooled. Show graphically the nature of the dependence of the height of the piston above the bottom of the vessel on temperature X(T). X=0 is the coordinate of the bottom of the vessel, X=X0 is the initial position of the piston.