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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 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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