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The International Association for the Properties of Water and Steam (IAPWS) is an international non-profit association of national organizations concerned with the properties of water and steam, particularly thermophysical properties and other aspects of high-temperature steam, water and aqueous mixtures that are relevant to thermal power cycles and other industrial applications.

The organization publishes a range of 'releases.' Specifically, these relate to the thermal and expansion properties of steam.

Both free software and commercial software implementations of the IAPWS correlations are available.

See for more details on the IAPWS. Their release documents are freely available from the site.