Water
IP (Inch-Pound) Units and the Btu
The tables and diagrams below were calculated using the REFPROP property package. In the IP unit system, REFPROP converts from SI to IP using the definition of the thermochemical Btu. This is based on 1 calorie = 4.184 J (exact). However, the Fifth International Conference on the Properties of Steam (London, July 1956) defined the International Table calorie as 4.1868 J. This leads to the more widely used International Table Btu = 1.05505585262 kJ. The REFPROP values having units containing Btu were converted to the International Table Btu to construct the tables and diagrams shown below. Comparison directly to REFPROP values that have units of Btu will be slightly different.
Disclaimer
This website is maintained to enhance public access to state-of-the-art thermophysical property information. This is a service that is continually under development. With respect to documents available from this website, the developer assumes no legal liability or responsibility for the accuracy, completeness, or usefulness of any information disclosed. Even though every attempt is made to keep the information timely and accurate, there are no guarantees.