density calculation according to Driesner et al: 10-1000degC; 0.1-500MPa; 0.25-5 mol/kg
function density_Driesner2007_pTX input SI.Pressure p; input SI.Temp_K T; input SI.MassFraction X[:] "mass fraction m_NaCl/m_Sol"; output SI.Density d; constant Real M_NaCl = PartialBrineMultiSaltOnePhase.Salt_data.M_NaCl "molar mass in [kg/mol]"; end density_Driesner2007_pTX;