(1)	$\begin{array}{l}\displaystyle \rho(p, T) = \frac{1}{Z} \cdot \frac{M}{R} \cdot \frac{p}{T}\end{array}$

where

$\begin{array}{l}\rho\end{array}$	Gas density	$\begin{array}{l}p\end{array}$	Gas pressure	$\begin{array}{l}M\end{array}$	Gas molar mass
$\begin{array}{l}Z\end{array}$	Compressibility factor	$\begin{array}{l}T\end{array}$	Gas temperature	$\begin{array}{l}R\end{array}$	Gas constant

Below is the list of the most popular correlations for Compressibility factor $\begin{array}{l}Z(p, T)\end{array}$ :

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See also