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Discussion

Match each region of the PVT surface with what is found there.
List I
A. Above the critical temperature
B. Inside the saturation dome
C. Left of the saturated liquid line
D. Right of the saturated vapour line
List II
1. a subcooled liquid
2. a single supercritical fluid
3. a superheated vapour
4. liquid and vapour in equilibrium

  • A.A-4, B-2, C-1, D-3
  • B.A-2, B-4, C-3, D-1
  • C.A-3, B-1, C-4, D-2
  • D.A-2, B-4, C-1, D-3

Answer: D

Locating a state on the diagram decides which relations may be used, since inside the dome pressure and temperature are no longer independent while outside it they are. Reading the region first prevents most errors in property lookup.

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