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Ice nucleating particles differ from cloud condensation nuclei chiefly in that they are

  • A.far scarcer and effective only at low temperatures
  • B.far more numerous and effective at any temperature
  • C.always soluble in water rather than insoluble
  • D.unable to influence cloud microphysics at all

Answer: A

Condensation nuclei number in the hundreds per cubic centimetre while ice nucleating particles are often fewer than one per litre. Their scarcity is the reason ice forms in only a small fraction of the available droplets.

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