RedlichKwong Equation of State
Similar to the PengRobinson equation, the parameter "a" accounts for the molecular attractions between particles, while the parameter "b" accounts for the volume occupied by the molecules themselves. These parameters are determined based on the critical properties (critical temperature and critical pressure) and other experimental data of the fluid.
The RedlichKwong equation of state, like the PengRobinson equation, can be used to calculate various thermodynamic properties of the fluid, including pressure, volume, temperature, and compressibility factor. It is also widely employed in the design and analysis of chemical processes, petroleum engineering, and other fields where accurate modeling of fluid behavior is crucial.
Both the PengRobinson and RedlichKwong equations of state are important tools in chemical engineering and thermodynamics for modeling the behavior of real gases and liquids under various conditions. Each equation has its strengths and weaknesses, and the choice between them often depends on the specific application and the accuracy required for the system being studied.
RedlichKwong Equation of State


\( p = (R \; T \;/\; V  b )  [ a \;/\; T^{0.5} V \; (V + b )\; ] \)  
Symbol  English  Metric 
\( p \) = pressure of fluid  \(lbf \;/\; in^2\)  \(Pa\) 
\( R \) = universal gas constant  \(lbfft\;/\;lbmolR\)  \(J\;/\;kmolK\) 
\( T \) = temperature  \(F\)  \(K\) 
\( V \) = molar volume of fluid  \(in^3\)  \(mm^3\) 
\( b \) = parameters specific to the fluid, known as the RedlichKwong parameters  \(in^3\)  \(mm^3\) 
\( a \) = parameters specific to the fluid, known as the RedlichKwong parameters     