Discussion
Which quantity does virtual temperature represent?
Answer: C
Because water vapour is lighter than dry air, moist air is less dense than dry air at the same temperature and pressure, and virtual temperature is the temperature adjustment that accounts for it. Using it allows the dry air gas constant to be retained in the equation of state. The adjustment reaches a few kelvin in the humid tropics and is negligible in polar air. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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