Redlich-Kwong equation of state

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The Redlich-Kwong equation of state is [1]:

.

The Redlich-Kwong equation of state has a critical point compressibility factor of [2]:

leading to

and

where is the pressure, is the temperature and is the molar gas constant. is the critical temperature and is the pressure at the critical point.

Soave Modification

A modification of the the Redlich-Kwong equation of state was presented by Giorgio Soave in order to allow better representation of non-spherical molecules[3]. In order to do this, the square root temperature dependence was replaced with a temperature dependent acentricity factor:

where is the critical temperature and is the acentric factor for the gas. This leads to an equation of state of the form:

or equivalently:


References