speed of sound as function of pressure and specific enthalpy
function velocityOfSound_props_ph extends Modelica.Icons.Function; input SI.Pressure p "pressure"; input SI.SpecificEnthalpy h "specific enthalpy"; input ThermalSeparation.Media.WaterBasedLiquid.BaseClasses.Common.IF97BaseTwoPhase aux "auxiliary record"; output SI.Velocity v_sound "speed of sound"; end velocityOfSound_props_ph;