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The amount of water vapour in the air is called

  • A.Hot air
  • B.Humidity
  • C.Dew
  • D.Foam

Answer: B

The amount of water vapour in the air is called humidity.

Absolute humidity is the mass of vapour per unit volume; relative humidity, the figure quoted in weather reports, is the ratio of the actual vapour pressure to the saturation value at that temperature. Dew forms when air is cooled until its relative humidity reaches 100 per cent.

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