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A cloud forms when a parcel of air

  • A.is cooled until its water vapour begins to condense
  • B.is warmed until it can hold rather more water vapour
  • C.is compressed until its internal pressure rises sharply
  • D.loses the whole of the water vapour it was carrying

Answer: A

Cooling reduces the saturation vapour pressure until the air already holds more vapour than it can retain. The excess condenses onto available particles, and it is those droplets rather than the vapour itself that are visible.

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