Discussion
Which quantity does an area on a tephigram represent?
Answer: A
Because the tephigram plots temperature against entropy, an area on it has the dimensions of energy per unit mass, which is what allows convective available potential energy to be measured directly. This property is shared by the skew-T and emagram and is the defining requirement of a usable thermodynamic diagram. Diagrams lacking it, such as the Stuve, trade the property for simplicity. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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