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@wikipedia

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T_r = \frac{T}{T_c}

where


The highest temperature 

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 of Vapour Liquid Equilibrium (VLE) in pure substance (see Fig. 1).

It is a 
material property of a pure substance.

Supercritical carbon dioxide - WikipediaImage Added

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

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actual temperature 

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critical temperature of the matter



See also

...

Natural Science / Physics / Thermodynamics / Thermodynamic system / Real Gas Critical Point

Pure Substance ]Critical Pressure (pc) ]

Pseudo-critical temperature (Tpc) ]