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