Developed by Russian National Committee (RNC) of
International Association for the Properties of Water and Steam (IAPWS).
This calculation page is based on the
"Revised Supplementary Release on Backward Equations for the Functions 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"  provided by IAPWS.
Detailed information about used equations, constants, range of validity etc is presented in PDF version of IAPWS document which can be downloaded from IAPWS web site www.iapws.org