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Pressure - Temperature (P-T, aka Phase State) Diagram

A common graphic used to illustrate the relationship of substances in their phase states as a function of pressure and temperature is the P-T diagram. It is also referred to as a phase state diagram or a phase change diagram. The asterisk in the P-T diagram below identifies a pressure-temperature combination that is known as the triple point, which is where the substance can simultaneously exist as a solid, a liquid, or a vapor.


P-T Diagram for a Substance That Expands On Freezing


Presure-Temperature (P-T, aka Phase) Diagram - RF Cafe
From To Phase Changes
Liquid Solid Fusion (aka Freezing)
Liquid Vapor Vaporization
Solid Vapor Sublimation
Solid Liquid Melting
Vapor Liquid Condensation
Vapor Solid Deposition
Critical Point Marker - RF Cafe Critical Point: Pure vapor phase has same properties as pure liquid phase at same temperature and pressure. It is the highest temperature at which a gas can be liquefied, regardless of pressure.
Triple Point Marker - RF Cafe Triple Point: Possible to maintain equilibrium mixture of all three phases.





Posted  March 13, 2015