Discussion
Which name is given to a surface of constant potential temperature?
Answer: C
Because entropy is a function of potential temperature alone for an ideal gas, the two descriptions are equivalent and the surfaces are called isentropic. Adiabatic parcels are confined to them, which is what makes them so useful for visualising three dimensional flow. Isobaric, isopycnal and isothermal surfaces are defined by pressure, density and temperature respectively. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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