A popular measure of temperature and pressure in Real Gas EOS modelling.

(1)	$\begin{array}{l}\displaystyle T_r = \frac{T}{T_c}\end{array}$

(2)	$\begin{array}{l}\displaystyle p_r = \frac{p}{p_c}\end{array}$

where

$\begin{array}{l}T\end{array}$	fluid temperature	$\begin{array}{l}T_c\end{array}$	critical temperature or pseudo-critical temperature of the material
$\begin{array}{l}p\end{array}$	fluid pressure	$\begin{array}{l}p_c\end{array}$	critical pressure or pseudo-critical pressure of the material

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See also