WOLFRAM SYSTEM MODELER
    v3a_psRegion 3 a: inverse function v(p,s)  | 
     | 

SystemModel["Modelica.Media.Water.IF97_Utilities.BaseIF97.Basic.v3a_ps"]

This information is part of the Modelica Standard Library maintained by the Modelica Association.
Equation number 8 from:
| p | 
         Type: Pressure (Pa) Description: Pressure  | 
    
|---|---|
| s | 
         Type: SpecificEntropy (J/(kg⋅K)) Description: Specific entropy  | 
    
| v | 
         Type: SpecificVolume (m³/kg) Description: Specific volume  | 
    
|---|