isobaric expansion coefficient as function of pressure and specific enthalpy
function beta_props_ph extends Modelica.Icons.Function; input Units.SI.Pressure p "pressure"; input Units.SI.SpecificEnthalpy h "specific enthalpy"; input ThermoSysPro.Properties.WaterSteam.Common.IF97BaseTwoPhase aux "auxiliary record"; output Units.SI.RelativePressureCoefficient beta "isobaric expansion coefficient"; end beta_props_ph;