Discussion
Match each quantity with what it measures.
List I
A. Fugacity coefficient
B. Activity coefficient
C. Compressibility factor
D. Poynting factor
List II
1. departure of PVT behaviour from the ideal gas law
2. departure of a gas from ideal gas behaviour
3. effect of pressure on the fugacity of a liquid
4. departure of a liquid from ideal solution behaviour
Answer: D
Correct answer: A-2, B-4, C-1, D-3
Four correction factors for four different departures. The fugacity coefficient measures a gas against the ideal gas. The activity coefficient measures a liquid against the ideal solution. The compressibility factor measures PVT behaviour against the ideal gas law. And the Poynting factor corrects a liquid fugacity from its saturation pressure to the system pressure. Each is unity when the corresponding idealisation holds.
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