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.
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