Whats the density of liquid water at 150 deg C and 150 bar pressure?
I realize that these items don’t answer your question, but they may point to a solution. You need to know how water expands with heat and contracts under pressure. The trouble is that the two effects interact! Compressibilty changes with temperature and thermal coefficient of expansion changes with pressure. If you know the laws that govern this “As pressure is added to the water” … “its volume decreases as water molecules are forced closer and closer together. Water at temperatures common in nature has a compressibility factor of around 0.0000034, meaning that a hydrostatic pressure of 6.89 kilopascals (1lb/ sq. in) would reduce unit volume by about 0.0000034 of the original volume.” (from Ref. 1) Ref. 2 provides densities of boiling water at the pressures needed to raise its boiling point to the givan temperatures. I hope you can make something of this. Sorry I couldn’t find better info. If you google “water density tables” you may do better than I could.
