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Pressure - Temperature (P-T) 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. That is where the substance can exist as a solid, a liquid, or a vapor.

P-T Diagram


P-T Diagram for a Substance That Expands On Freezing

From To Phase Changes
Liquid Solid Fusion
Liquid Vapor Vaporization
Solid Vapor Sublimation
Solid Liquid Melting
Vapor Liquid Condensation
Vapor Solid Deposition
. Critical
     Point:

Pure vapor phase has same properties as pure liquid phase at same temperature and pressure.
* Triple
     Point:
Possible to maintain equilibrium mixture of all three phases.

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