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The highest temperature  of Vapour Liquid Equilibrium (VLE) 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 ]Critical Pressure (pc) ]

Pseudo-critical temperature (Tpc) ]