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Thermodynamics: P-T Diagram

The P-T diagram also known as the phase diagram is used to show where the phase change of a substance will occur when it is at a certain temperature or pressure. To see what a P-T diagram looks like refer to the figure below.

P-T Diagram

The triple point represents where the tipple line would occur on the P-v diagram, or in other words all three phases could exist together at that point.

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