Thermal Physics - Thermal Equilibrium

See Problem #46

In which region are the liquid and the vapor in equilibrium with each other?

A. A
B. B
C. C
D. D
E. E
(GR9277 #47)
Solution:

Region A: V small  → Liquid
Region E: P large, V small → Liquid
Region D and C: V large →  Gas
Phase equilibrium exists only if the temperature of isotherm lies below critical temperature.

Answer: B

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