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Collision growth between cloud droplets requires above all

  • A.a difference in fall speed between the droplets
  • B.an identical fall speed for every droplet present
  • C.a supersaturation greater than one per cent
  • D.the presence of ice crystals in the same volume

Answer: A

Correct answer: a difference in fall speed between the droplets

Collision requires one droplet to overtake another, and that requires them to fall at different speeds - which in turn requires them to differ in size. A population of identical droplets falls together and never collides, however dense it is, which is why the initial breadth of the droplet spectrum matters so much.

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