This is one of the industry basic charts based n

where

$\begin{array}{l}Z\end{array}$	Z-factor
$\begin{array}{l}T\end{array}$	°Rankine	fluid temperature	$\begin{array}{l}T_r = T/T_c\end{array}$	Reduced Temperature	$\begin{array}{l}T_c\end{array}$	°Rankine	critical temperature or pseudo-critical temperature of the material
$\begin{array}{l}p\end{array}$	psi	fluid pressure	$\begin{array}{l}p_r = p/p_c\end{array}$	Reduced Pressure	$\begin{array}{l}p_c\end{array}$	psi	critical pressure or pseudo-critical pressure of the material

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See also