This information is part of the Modelica Standard Library maintained by the Modelica Association.

Equation number 3 from:
The International Association for the Properties of Water and Steam
Gaithersburg, Maryland, USA
September 2001
Supplementary Release on  Backward Equations for Pressure as a Function of Enthalpy and Entropy p(h,s) to the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam

p = p2a_hs(h, s)

h	Type: SpecificEnthalpy (J/kg) Description: Specific enthalpy
s	Type: SpecificEntropy (J/(kg·K)) Description: Specific entropy

p	Type: Pressure (Pa) Description: Pressure