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LaTeX Math Inline
body\rho

Gas density

LaTeX Math Inline
bodyp

Gas pressure

LaTeX Math Inline
bodyM

Gas molar mass

LaTeX Math Inline
bodyZ

Compressibility factor

LaTeX Math Inline
bodyT

Gas temperature

LaTeX Math Inline
bodyR

Gas constant


Despite the name it covers a lot of practical  liquids as well.


The 
Compressibility factor 

LaTeX Math Inline
bodyZ(p, T)
 pressure-temperature dependence is usually modelled through the reduced properties
LaTeX Math Inline
bodyZ(T_r, p_r)
, where:

LaTeX Math Inline
bodyT_r = T/T_c

Reduced Temperature

LaTeX Math Inline
bodyp_r = p/p_c

Reduced Pressure

 


Below is the list of the most popular correlations for Compressibility factor 

LaTeX Math Inline
bodyZ(p, T)
:

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