Critical point (thermodynamics)
A critical point is a point on a phase diagram at which the liquid and gas phases of a substance have the same density, and so are not distinguishable from each other.
Critical Point (thermodynamics) Media
The liquid–vapor critical point in a pressure–temperature phase diagram is at the high-temperature extreme of the liquid–gas phase boundary. The dashed green line shows the anomalous behavior of water.
Isotherms of a gas. The red line is the critical isotherm, with critical point K. The dashed lines represent parts of isotherms which are forbidden since the gradient would be positive, giving the gas in this region a negative compressibility.
Critical carbon dioxide exuding fog while cooling from supercritical to critical temperature.
