Discussion
Match each drop category with its typical diameter.
List I
A. Cloud droplet
B. Drizzle drop
C. Small raindrop
D. Large raindrop
List II
1. about 1 millimetre
2. about 20 micrometres
3. about 4 millimetres
4. about 200 micrometres
Answer: B
Correct answer: A-2, B-4, C-1, D-3
The four sizes span more than two orders of magnitude: a cloud droplet at about 20 micrometres, a drizzle drop at 200, a small raindrop at a millimetre and a large one at four. The gap between the first two is the one collection must bridge, and it is why the transition from cloud to rain is the central problem of the subject.
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