HPP's for Phase Changes

In the previous lesson, we used

hypothetical process paths

to make it easier to determine the change in the properties of an ideal gas, liquids and solids for which Molar volume is constant, and real substances for which we have thermodynamic tables.
BUT only in one phase !
Initial State
Final State
The solid curve shown here represents the infinite set of states that the system passes trhough during a process.
In this lesson, we will learn how to use

hypothetical process paths

to determine the change in properties associated with a

phase change

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Ch 3, Lesson E, Page 1 - HPP's for Phase Changes