Discussion
Which name is given to a surface of constant potential temperature?
Answer: D
Because entropy is a function of potential temperature alone for an ideal gas, surfaces of constant potential temperature are surfaces of constant entropy. Adiabatic parcels remain on them, which is what makes isentropic analysis such a natural way to visualise three dimensional flow. Isobaric, isopycnal and isothermal surfaces are defined by other quantities entirely. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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