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Homogeneous freezing of pure water droplets occurs at approximately

  • A.minus 10 degrees Celsius
  • B.minus 100 degrees Celsius
  • C.minus 40 degrees Celsius
  • D.0 degrees Celsius

Answer: C

Below about minus forty the ice embryo forms spontaneously without any foreign particle. Above that temperature freezing in the atmosphere requires an ice nucleating particle of some kind. Such particles are far too scarce to freeze every droplet.

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