Superheated H20 at 400 kPa is slowly cooled in a sealed rigid vessel until the temperature is measured to be 115 centigrade, when condensation first occurs. What is the Initial Temperature? I know that the temperature and pressure at point two (saturated vapor) can be found in a standard saturated water vapor table. I found Tsat and Psat to be 115 Centigrade and 169.18 kPa respectively. Is there enough information here to find the initial temperature of the superheated vapor? how do I proceed?