Discussion
Which property must a usable thermodynamic diagram possess?
Answer: A
The defining requirement is that an area enclosed on the diagram represents work or energy per unit mass, which is what allows convective available potential energy to be measured directly as the area between two curves. Diagrams achieving this are said to be area preserving or equal area. The tephigram, skew-T and emagram all have the property while the Stuve does not, which is why the Stuve is chosen only where simplicity matters more than quantitative work. No diagram can make every family of lines straight while preserving the area property, so each design trades one convenience against another.
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