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Drop breakup limits the maximum size of a raindrop at roughly

  • A.a few tenths of a millimetre in diameter
  • B.a few millimetres in diameter
  • C.a few centimetres in diameter
  • D.a few micrometres in diameter

Answer: B

Correct answer: a few millimetres in diameter

Beyond about five or six millimetres the aerodynamic forces flatten the drop and then hollow it into a bag which bursts. That sets a ceiling on drop size regardless of how much water is available, and it is why heavy rain consists of many drops rather than a few very large ones.

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