returns specific entropy for a given p and h
function specificEntropy_phX_state extends Modelica.Icons.Function; input AbsolutePressure p "Pressure"; input SpecificEnthalpy h "Specific Enthalpy"; input MassFraction X[nX] "Mass fractions"; input ThermodynamicState state; output SpecificEntropy s "Specific Entropy"; end specificEntropy_phX_state;