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Entrainment of environmental air into a growing cumulus tends to

  • A.have no measurable effect on the cloud
  • B.dilute the cloud and reduce its buoyancy
  • C.increase the liquid water content of the cloud
  • D.raise the temperature of the cloudy air

Answer: B

Drier and cooler surroundings mixed in evaporate some of the droplets, which cools the parcel further and reduces its buoyancy. It is the main reason observed updraught temperatures fall short of the undiluted adiabatic value.

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