speed of sound as function of pressure and specific enthalpy
function velocityOfSound_props_ph extends Modelica.Icons.Function; input Units.SI.Pressure p "pressure"; input Units.SI.SpecificEnthalpy h "specific enthalpy"; input ThermoSysPro.Properties.WaterSteam.Common.IF97TwoPhaseAnalytic aux "auxiliary record"; output Units.SI.Velocity v_sound "speed of sound"; end velocityOfSound_props_ph;