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Dry ice seeding produces ice crystals by

  • A.raising the temperature of all the supercooled droplets present
  • B.chilling a volume of air below the homogeneous freezing point
  • C.supplying a lattice upon which the ice can nucleate
  • D.adding water vapour directly into the body of the cloud

Answer: B

A pellet of solid carbon dioxide is far colder than minus forty and freezes droplets in its wake. It leaves no residue in the cloud, which is one argument advanced in its favour. Nothing chemical remains in the cloud after the pellet has gone.

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