Density derivative by pressure
function ddph_props extends Modelica.Icons.Function; input Modelica.SIunits.Pressure p "Pressure"; input Modelica.SIunits.SpecificEnthalpy h "Specific enthalpy"; input Common.AuxiliaryProperties aux "Auxiliary record"; output Modelica.SIunits.DerDensityByPressure ddph "Density derivative by pressure"; end ddph_props;