Critical Point

State at which two phases of a substance first become indistinguishable.

Example
At pressures higher than 217.6atm and temperatures above 374C, the meniscus between steam and liquid water will vanish; the two phases become indistinguishable and are referred to as a supercritical fluid.

See also: Critical Density, Critical Molar Volume, Critical Pressure, Critical State, Critical Temperature, Critical Volume.

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Subjects: Thermodynamics