Hi all : ) I have a basic physics question: Let's say I have a sealed metal cylinder with a volume of 1L. It contains 1/3 air and 2/3 water. I heat the container from 20C to 140C. How can I determine the change in pressure or final pressure? I guess I can calculate the pressure change of the air using the combined gas law, but I don't know how the heated water factors in. Any comments, formulas would be much appreciated!