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Homework Help: Thermodynamics - Piston Cylinder

  1. Sep 27, 2012 #1
    A piston-cylinder device initially contains 1.4-kg saturated liquid water at 200 C. Now heat is transferred to the water until the volume quadruples and the cylinder contains saturated vapour only. Determine:
    (a) the volume of the tank,

    -> Use P1 = P2 to solve -> find Vg at 200oC

    (b) the final temperature and the pressure, and

    P2 does not equal P1. Why?

    I already have the solution for the above problem but I would like to know why for part b we don't have the final pressure = initial pressure.

    I thought that all piston cylinder devices undergo isobaric processes.

    Thanks in advance guys!
  2. jcsd
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