I have a pressure vessel of volume V= 1 m^3 . The atmospheric pressure Patm = 101 kPa and Tatm = 22 C. I slowly pump liquid water into the pressure vessel until the internal pressure reaches P1 = 15 MPa. Also, the process is isothermal because the water was pumped in slowly and heat is exchange with the atmosphere. What is the potential energy stored in the tank of water? For example, how much energy could possible be released with the case burst? Assuming the energy stored in the case is negligible.