Discussion
Match each cubic equation of state with its distinguishing feature.
List I
A. Van der Waals
B. Redlich-Kwong
C. Soave-Redlich-Kwong
D. Peng-Robinson
List II
1. an alpha function fitted to vapour pressure data
2. the first cubic, with a temperature-independent attraction term
3. a modified volume term giving better liquid densities
4. an attraction term divided by the square root of temperature
Answer: B
The family is a sequence of repairs to one idea, each addressing a specific failing of its predecessor. Knowing which repair each made is what guides the choice of equation for a particular duty. The lineage runs from eighteen seventy-three to the modern packages.
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