Discussion
Which surfaces do parcels remain on during adiabatic motion?
Answer: D
Constant entropy means constant potential temperature, so an adiabatic parcel is confined to its isentropic surface and its vertical motion is entirely determined by the slope of that surface. This is what makes isentropic analysis such a natural way to visualise three dimensional flow. Pressure, temperature and density all change as the parcel moves along the surface. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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