density as function of pressure and specific entropy
function rho_props_ps extends Modelica.Icons.Function; input Units.SI.Pressure p "pressure"; input Units.SI.SpecificEntropy s "specific entropy"; input ThermoSysPro.Properties.WaterSteam.Common.IF97BaseTwoPhase properties "auxiliary record"; output Units.SI.Density rho "density"; end rho_props_ps;