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For a fixed liquid water content, increasing the number of cloud condensation nuclei

  • A.removes the droplets from the cloud entirely
  • B.reduces the average size of the resulting droplets
  • C.increases the average size of the resulting droplets
  • D.leaves the average droplet size unchanged

Answer: B

The same mass of condensed water is divided among more droplets, so each is smaller. The consequences run through the whole life of the cloud, from its brightness to how readily it produces rain. Aerosol number is therefore a microphysical control on macroscopic behaviour.

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