A piston/cylinder setup (Fig. P3.171) contains 1 kg of water at 20◦C with a volume of 0.1 m3. Initially, the piston rests on some stops with the top surface open to the atmosphere, P0, and a mass such that a water pressure of 400 kPa will lift it. To what temperature should the water be heated to lift the piston? If it is heated to saturated vapor, find the final temperature, volume, and work, 1W₂.