IAPWS Industrial Formulation 1997

For background information about the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam (IAPWS-IF97) and references see IAPWS-IF97 release and IAPWS Formulation 2008 for the Viscosity of Ordinary Water Substance.

The IAPWS-IF97 divides the thermodynamic surface into five regions (see figure below):

IAPWS 97 regions

Properties of Water and Steam calculator

Temperature :
Pressure :

Program description

Program in Javascript is designed to provide a fremework for further development. Only properties from basic equations are covered for regions 1, 2 and 3. Backward equations are not implemented. For Region 3 density must be calculated from pressure with Newton iteration. All regions give correct verification results.

It seems that not all users realise the kind of software which is described here. When you calculate properties the program runs on your machine! Please use view Page source to review the source code or click this link for fancy listing. This is NOT external program calculator! That's why it is licensed by the following licence.


Copyright 2001, 2014 Leon Kos, University of Ljubljana

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License , or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

The software is released under GNU General Public License.

University of Ljubljana, Slovenia

Last modified: Fri Jun 13 22:30:50 CEST 2014