Discussion
Which term describes a discrete rising bubble of warm air?
Answer: D
A thermal is a discrete bubble that detaches from a heated patch of ground and rises as a coherent vortex ring, entraining environmental air as it goes. A plume is a continuous release from a steady source such as a chimney or a forest fire. The distinction matters because the two have different entrainment behaviour and different vertical profiles of buoyancy. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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