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# Benedict, Webb and Rubin equation of state

The **Benedict, Webb and Rubin equation of state** is an empirical equation of state, based on the Beattie-Bridgeman equation of state, which has the following functional form (Eq. A10 of ^{[1]}):

where is the pressure, is the temperature, is the density, and is the molar gas constant. , , , , , , and are adjustable parameters.

## References[edit]

**Related reading**

- Manson Benedict, George B. Webb, and Louis C. Rubin "An Empirical Equation for Thermodynamic Properties of Light Hydrocarbons and Their Mixtures II. Mixtures of Methane, Ethane, Propane, and n-Butane", Journal of Chemical Physics
**10**pp. 747-758 (1942) - Giorgio S. Soave "An effective modification of the Benedict–Webb–Rubin equation of state",Fluid Phase Equilibria
**164**pp. 157-172 (1999)