Region 3 b: inverse function v(p,s)
 
  Equation number 9 from:
 
 [1] The international Association
 for the Properties of Water and Steam
  Vejle, Denmark
  August 2003
  Supplementary Release on Backward Equations for the Fucnctions
 T(p,h), v(p,h) and T(p,s), 
  v(p,s) for Region 3 of the IAPWS Industrial Formulation 1997 for
 the Thermodynamic Properties of
  Water and Steam
 
 
function v3b_ps
  extends Modelica.Icons.Function;
  input SI.Pressure p "Pressure";
  input SI.SpecificEntropy s "specific entropy";
  output SI.Volume v "specific volume";
end v3b_ps;
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