1. The problem statement, all variables and given/known data 1kg of water fills 151.1L of rigid container at pressure 2MPa. Then the container is cooled to 40C. What is the final pressure? 2. Relevant equations Steam table properties. 3. The attempt at a solution How can we know the pressure? I think it is wrong to assume that the specific volume at 40C is the same with the specific volume at 2MPa. Any hint?