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The end point  of a phase equilibrium curve above which the liquid and gas state of matter do not have a distinct boundary (see Fig. 1).

It is characterized by critical temperature  and critical pressure  , both being material property.

Supercritical carbon dioxide - Wikipedia

Fig. 1. Schematic diagram with Critical Point.


See also


Natural Science / Physics / Thermodynamics / Thermodynamic system Real Gas

Сritical Temperature Tc ] [ Critical Pressure (pc) ]