IAPWS SR7-09
Supplementary Release on a Computationally Efficient Thermodynamic
Formulation for Liquid Water for Oceanographic Use
September 2009
PDF of document
Description
This formulation is recommended for the calculation of thermodynamic properties
of ordinary water in its liquid phase as the pure-water part of seawater calculations
for oceanographic use where a simplified formulation is preferred.
The formulation is for the Gibbs energy as a function of temperature and pressure;
appropriate combinations of derivatives can produce any thermodynamic property desired
(density or specific volume, sound speed, heat capacity, enthalpy, entropy, etc.).
The formulation is valid and consistent with the
IAPWS-95 formulation in entire region of ambient ocean water,
up to 313.15 K and 100 MPa, including the metastable liquid phase found between the
freezing temperatures of pure water and seawater.
The development of the formulation and comparisons to
available data are described in detail in a
scientific article.
Software Implementation
The IAPWS Subcommittee on Seawater, in cooperation with the
SCOR/IAPSO Working Group 127,
developed the "Thermodynamic Equation of Seawater 2010" (TEOS-10) which was endorsed as an international standard for oceanography by
UNESCO-IOC in 2009 and by
IUGG in 2011.
The open-source code of TEOS-10
includes software implementations of this IAPWS formulation.
Note that IAPWS is not responsible for the content of these external pages.
Revision History
- This Supplementary Release was adopted by IAPWS in 2009.
This Supplementary Release is the product of the Working Group "Thermophysical Properties of Water and Steam" (TPWS) and the Subcommittee on Seawater (SCSW) of the International Association for the Properties of Water and Steam (IAPWS).
This page updated May 29, 2018
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