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State whether the following is true or false.
Condensation in the atmosphere requires a surface on which the vapour can condense.

  • A.True
  • B.False
  • C.True only at large scales
  • D.False only at small scales

Answer: A

Condensation without any nucleus needs supersaturations of several hundred per cent, which never occur in the atmosphere. Aerosol particles serving as cloud condensation nuclei are effectively always present in sufficient numbers.

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