Delmarrey, I see what you're saying. Propane will boil at about -44F, It will turn back to liquid just below -44F at sea level. If you increase the pressure to about 120 PSI, it won't boil until about 70F. Think about what happens in a pressure cooker. At normal sea level pressure water
transforms to gas at about 212F. If you enclose it in a pressure cooker and raise the pressure the water
won't boil until it is much hotter. Conversly if you take your pot of water to a higher altitude and lower the pressure it will boil at less than 212F.