Critical Point

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Critical Point


The thermodynamic state in which liquid and gas phases of a substance coexist in equilibrium at the highest possible temperature. At higher temperatures than the critical no liquid phase can exist. For water substance the critical point is
Ps = 2.21 X 10 5 millibars
T = 647 K
v = 3.10 grams/cubic centimeter
where Ps is the saturation vapor pressure of the water vapor; T is the Kelvin temperature; and v is the specific volume. </P>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use