Discussion
Which form of work does a parcel of air do as it rises?
Answer: B
As a parcel rises the surrounding pressure falls, so the parcel expands and does work on its surroundings, and with no heat supplied that work comes from its internal energy. The temperature therefore falls. Gravity acts on the parcel but the work against gravity appears as potential energy rather than as a loss of internal energy, which is a distinction worth keeping clear. The Coriolis force does no work at all because it acts perpendicular to the motion.
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