Chapter 1
U.S. Customary and SI Units


This booklet is a product of the Properties Subcommittee of the ASME Research and Technology Committee on Water and Steam in Thermal Systems. The properties are computed from the “IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam,” adopted for industrial use by the International Association for the Properties of Steam (IAPWS). More comprehensive tables and charts from this formulation are published in: W.T. Parry, J.C. Bellows, J.S. Gallagher, and A.H. Harvey, ASME International Steam Tables for Industrial Use (ASME Press, New York, 2000). Software implementing this formulation is also available from ASME under the title ASME Steam Properties for Industrial Use.

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