WOLFRAM SYSTEM MODELER
    p2a_hsPressure as a function of enthalpy and entropy in subregion 2a  | 
     | 

SystemModel["Modelica.Media.Water.IF97_Utilities.BaseIF97.Basic.p2a_hs"]

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
| h | 
         Type: SpecificEnthalpy (J/kg) Description: Specific enthalpy  | 
    
|---|---|
| s | 
         Type: SpecificEntropy (J/(kg⋅K)) Description: Specific entropy  | 
    
| p | 
         Type: Pressure (Pa) Description: Pressure  | 
    
|---|