Discussion
Which definition does potential temperature have?
Answer: D
Bringing the parcel adiabatically to a standard reference pressure removes the effect of its current height, so that parcels at different levels can be compared directly. The reference of 1000 hectopascals is a convention chosen for arithmetic convenience. The other options define the dew point and the equivalent temperature, both of which answer different questions. Checking the units of each quantity catches a wrong formula before the arithmetic begins. The shared properties explain why these belong to one family, and the differences explain why more than one exists. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted. Checking the units of each quantity catches a wrong formula before the arithmetic begins. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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