1. The problem statement, all variables and given/known data My question has to do with heating water to a superheated state inside a constant volume vessel. Given: A pressure vessel with a total volume of 36.77ft^3, is filled with 5 gal of water and heated from room temp. to a final temp. of 1100°F. Obvisouly the initial pressure is atmospheric and the initial temp. is room, or lets say 80°F. Find: Final pressure of vessel. In the end I will vary the amount of water in the vessel to obtain a curve relating the volume of water to the final pressure but we can assume 5 gal for the beggining. I have worked on this for some time and am sure that it is much simpler than I am making it out to be. I am aware that the Ideal Gas Law may not be applied since the gas will be water vapor at a high pressure. Hopefully one of you can enlighten me. Thanks 2. Relevant equations Steam Tables 3. The attempt at a solution i've used many approaches such as heat transfer finding the Q, and the ideal gas law.