# Question: a vertical cylinder fitted with a frictionless piston contains 08...

###### Question details

A vertical cylinder fitted with a frictionless piston contains 0.8 kg of H2O initially at 100 kPa. The piston is initially supported by a set of stops, giving an initial volume of 0.5 m3. A pressure of 200 kPa is required to lift the piston off the stops. The system is slowly heated until the temperature is 300 C.

a) Find the initial temperature.

b) If the piston leaves the stops, calculate the temperature when it first lifts off.

c) Determine the final pressure.

d) Calculate the work and heat transfer for the entire process.

e) Show the process on a T-v and P-v diagram including the saturation curve.