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The '''Benedict, Webb and Rubin equation of state''' is an empirical [[Equations of state | equation of state]], based on the [[Beattie-Bridgeman equation of state]], which  has the following functional form (Eq. A10 of <ref>[http://dx.doi.org/10.1063/1.1750658    Manson Benedict, George B. Webb, and 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 '''8''' pp. 334-345 (1940)]</ref>):
{{Stub-general}}
:<math>P= RT\rho + \left( B_0 RT - A_0 - \frac{C_0}{T^2}  \right)\rho^2  + (bRT -a)\rho^3 + a \alpha \rho^6 + \frac{c\rho^3 ( 1 + \gamma \rho^2) \exp (-\gamma \rho^2)}{T^2}</math>
'''Benedict, Webb and Rubin equation of state''' <ref>[http://dx.doi.org/10.1063/1.1750658    Manson Benedict, George B. Webb, and 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 '''8''' pp. 334-345 (1940)]</ref><ref>[http://dx.doi.org/10.1063/1.1723658    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)]</ref>
where <math>P</math> is the [[pressure]], <math>T</math> is the [[temperature]], <math>\rho</math> is the density, and <math>R</math> is the [[molar gas constant]].
<math>B_0</math>, <math>A_0</math>, <math>C_0</math>, <math>b</math>, <math>a</math>, <math>c</math>, <math>\gamma</math> and <math>\alpha</math> are adjustable parameters.
==References==
==References==
<references/>
<references/>
'''Related reading'''
'''Related reading'''
*[http://dx.doi.org/10.1063/1.1723658    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)]
*[http://dx.doi.org/10.1016/S0378-3812(99)00252-6 Giorgio S. Soave "An effective modification of the Benedict–Webb–Rubin equation of state",Fluid Phase Equilibria  '''164''' pp. 157-172 (1999)  ]
*[http://dx.doi.org/10.1016/S0378-3812(99)00252-6 Giorgio S. Soave "An effective modification of the Benedict–Webb–Rubin equation of state",Fluid Phase Equilibria  '''164''' pp. 157-172 (1999)  ]
[[category: equations of state]]
[[category: equations of state]]
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