returns specific entropy for a given p and T
function specificEntropy_pT extends Modelica.Icons.Function; input AbsolutePressure p "Pressure"; input Temperature T "Temperature"; input FixedPhase phase = 0 "2 for two-phase, 1 for one-phase, 0 if not known"; output SpecificEntropy s "Specific Entropy"; end specificEntropy_pT;