What is a Phase Diagram ?

Phase diagrams depict how the primary phases (solid, liquid, gas) of a substance change as
the pressure, volume and temperature of the system change.
Phase diagrams are constructed by plotting the following :
1. Temperature as a function of the molar volume (T-Molar volume)
2. Pressure as a function of the molar volume (P-Molar volume)
3. Pressure as a function of temperature (P-T)
Note : The molar volume, Molar volume, is the volume per mole :
The specific volume, Specific volume, is the volume per unit mass :
defining equation for molar volume
defining equation for specific volume
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Ch 2, Lesson B, Page 1 - What is a Phase Diagram ?