Discussion
Which quantity is conserved during that adiabatic rearrangement?
Answer: D
Adiabatic rearrangement moves parcels without changing their potential temperature, so the mass contained between any two isentropic surfaces is preserved. Temperature and pressure both change as the parcels are moved. The construction is a thought experiment rather than a physical process, but it gives a well defined and computable reference against which the actual state is measured. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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