So, Water boils at 100C under normal sea-level air pressure. In Denver, it boils at around 95C, or something like that.

Another example is how a pressure cooker increases the temperature at which liquids boil.

The thing is I am trying to find a formula that will let me calculate the phase change temperature for object X at Pressure P, hopefully of density ρ.

Since I don't have experience in differential equations, it would be nice if I could find one that is straight boring algebra, but a differential will work if nothing else is available.