Redlich-Kwong Equation of State

Written by Jerry Ratzlaff on . Posted in Thermodynamics

Redlich-Kwong equation of state derives from the Van der Waals equation and generally more accurate.  It is not used as much becaused the overall difficulty to use.


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Redlich-Kwong Equation of State Formula

\(\large{ p =  \frac{R \; T}{ V_m \;-\; b }  -  \frac{ a }{ \sqrt{T} \; V_m \; \left( V_m \;+\; b \right)'  }   }\)   


 Units English Metric
\(\large{ p }\) = pressure of gas \(\large{\frac{lbf}{in^2}}\) \(Pa\)
\(\large{ a }\) = correction for the intermolecular forces   \(\large{dimensionless}\)
\(\large{ b }\) = adjusts for the volume occupied by the gas particles \(\large{in^3}\) \(\large{mm^3}\)
\(\large{ V_m }\) = molar volume of gas \(\left( \frac{V}{n} \right) \) \(\large{\frac{ft^3}{mol}}\) \(\large{\frac{m^3}{mol}}\)
\(\large{ n }\) = number of moles of gas \(\large{dimensionless}\)
\(\large{ R }\) = specific gas constant (gas constant) \(\large{\frac{lbf-ft}{lbm-R}}\) \(\large{\frac{J}{kg-K}}\)
\(\large{ T }\) = temperature of gas \(\large{R}\) \(\large{K}\)


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Tags: Equations for Gas Equations for Ideal Gas