Critical point (thermodynamics)

1. Subcritical ethane, liquid and gas phase coexist
2. Critical point (32.17 °C, 48.72 bar), opalescence
3. Supercritical ethane, fluid[1]

The liquid-vapor critical point in a pressure–temperature phase diagram is at the high-temperature extreme of the liquid–gas phase boundary. The dotted green line shows the anomalous behavior of water.

The critical isotherm with the critical point K

Carbon dioxide exuding fog while cooling from supercritical to critical temperature

In thermodynamics, a critical point (or critical state) is the end point of a phase equilibrium curve. The most prominent example is the liquid-vapor critical point, the end point of the pressure-temperature curve that designates conditions under which a liquid and its vapor can coexist. At the critical point, defined by a critical temperature T_c and a critical pressure p_c, phase boundaries vanish. Other examples include the liquid–liquid critical points in mixtures.

单词	Critical property
释义	Critical property 英语百科 Critical point (thermodynamics) In thermodynamics, a critical point (or critical state) is the end point of a phase equilibrium curve. The most prominent example is the liquid-vapor critical point, the end point of the pressure-temperature curve that designates conditions under which a liquid and its vapor can coexist. At the critical point, defined by a critical temperature T_c and a critical pressure p_c, phase boundaries vanish. Other examples include the liquid–liquid critical points in mixtures.
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Critical property

Critical point (thermodynamics)