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The highest pressure  of Vapour Liquid Equilibrium (VLE) curve in pure substance (see Fig. 1).

It is a 
material property of a pure substance.

Supercritical carbon dioxide - Wikipedia

Fig. 1Schematic PT diagram with Vapour Liquid Equilibrium and Critical Point (Tc, pc).


See also


Natural Science / Physics / Thermodynamics / Thermodynamic system Critical Point

Pure Substance ]Сritical Temperature Tc ] 

Pseudo-Critical Pressure (Ppc) ]