The Benedict-Webb-Rubin equation is an equation of state for real gases . It is suitable for describing dense gases and represents a good compromise between simplicity and accuracy.
It was developed in 1940 by chemists from Kellogg, including Manson Benedict .
It contains eight constants , , , , , , , which are tabulated for many materials, and reads:
The BWRS equation
Professor Kenneth Starling of the University of Oklahoma modified the BWR equation; the resulting BWRS equation also contains the three constants , and .
↑ Manson Benedict, George B. Webb, Louis C. Rubin, An Empirical Equation for Thermodynamic Properties of Light Hydrocarbons and Their Mixtures: I. Methane, Ethane, Propane, and n-Butane, Journal of Chemical Physics, Volume 8, 1940, Pp. 334-345