Discussion
Arrange these mechanisms in the order they typically dominate a droplet's growth history.
1. collection of smaller droplets
2. activation on a condensation nucleus
3. breakup on reaching the size limit
4. diffusional growth from vapour
Answer: B
Correct answer: 2 - 4 - 1 - 3
The history runs from a nucleus to a raindrop and out again. A droplet activates on a condensation nucleus, grows by diffusion of vapour until that becomes too slow, then grows by collecting other droplets, and finally breaks up on reaching the aerodynamic size limit.
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