LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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The Critical Point of a Liquid–Vapor Transition
-The tangents to the two curves in Figure 5.6
represent the molar volumes. In the case of a liquid–
vapor transition the two molar volumes become more
and more nearly equal to each other as the
temperature is increased toward the critical
temperature. The tangents to the curves approach
each other more and more closely until there is only
one curve at the critical temperature.
- At the critical point, the two curves representing Sm
in Figure 5.8 also merge into a single curve. The
molar entropy of the liquid and the molar entropy of
the gas phase approach each other.
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