Developed by Russian National Committee (RNC) of
International Association for the Properties of Water and Steam (IAPWS).
This calculation page is based on the
"Release on the IAPWS Formulation 2011 for the Thermal Conductivity of Ordinary Water Substance" 
provided by IAPWS.
Detailed information about used equations, constants, range of validity etc is presented in PDF version of IAPWS Release which can be downloaded from IAPWS web site www.iapws.org