Steam at 20 bars is in the saturated vapor state (call this state 1) and contained in a piston-cylinder device with a volume of 0.03 m3. Assume the steam is cooled at constant volume (i.e. the piston is held fixed in place) until the temperature reaches 200 C (call this state 2). Then the steam is expanded isothermally until its volume is twice the initial value (state 3).
(a) Determine the pressures at state 2 and 3.
(b) Determine the change in specific internal energy, u, for each of the two processes.