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Revised Release on the IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use

. (September 2009)

Abstract

This revised release replaces the corresponding release of 1996 and contains 18 pages, including this cover page. This release has been authorized by the International Association for the Properties of Water and Steam (IAPWS) at its meeting in Doorwerth, The Netherlands, 6-11 September, 2009, for issue by its Secretariat. The members of IAPWS are: Britain and Ireland, Canada, the Czech Republic, Denmark, France, Germany, Greece, Japan, Russia, and the United States of America, and associate members Argentina and Brazil, Italy, and Switzerland. The formulation provided in this release is recommended for general and scientific use; further details about the formulation can be found in an article ” The IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use” by W. Wagner and A. Pruß 1. This formulation provides the most accurate representation of the thermodynamic properties of the fluid phases of water substance over a wide range of conditions available at the time this release was prepared. IAPWS also has a formulation intended for industrial use. This revised release is identical to the original release issued by IAPWS in 1996, except for inclusion of the calculated triple-point pressure, improved values for the coefficients n1 and n2 in Table 1 to match more accurately the arbitrary conventions for the zeros of energy and entropy. The improved coefficients produce slight changes in the numerical values of u, s, h, f, and g; other properties (and all measurable differences in properties) are unchanged. Minor editorial corrections have also been made, including corrections in the last digits of a few calculated values in Tables 6-8 and updates to references. Further information about this release and other releases issued by IAPWS can be obtained from the Executive Secretary of IAPWS or from http://www.iapws.org.

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