Discussion
Which advantage does geopotential height have over geometric height?
Answer: B
Because geopotential height is defined through the work done against gravity, surfaces of constant geopotential height are surfaces of constant energy, and the variation of gravity no longer complicates the equations. Radiosondes measure pressure and temperature and derive height hypsometrically, so temperature is very much required. The two heights differ by only a small amount that changes sign with latitude. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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