Discussion
The ventilation coefficient in the growth equation accounts for
Answer: B
Correct answer: enhanced vapour transfer to a droplet that is falling
A stationary droplet is surrounded by a diffusive shell that limits the vapour reaching it. A falling droplet continually moves into fresh air, thinning that shell and increasing the transfer, and the ventilation coefficient corrects the growth equation for it. It is negligible for small cloud droplets and becomes important for the larger, faster-falling ones.
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