Discussion
Which quantity is conserved by a parcel undergoing dry adiabatic motion?
Answer: B
Potential temperature, the temperature a parcel would have if brought adiabatically to 1000 hectopascals, is conserved for dry adiabatic motion and is therefore the natural label for an air mass. Temperature itself changes as the parcel expands or compresses. Equivalent potential temperature is conserved for moist adiabatic motion too, which makes it the more general of the two. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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