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All of the following are ways in which air can reach saturation EXCEPT

  • A.cooling by adiabatic ascent
  • B.cooling by contact with a cold surface
  • C.adding water vapour by evaporation
  • D.compressing the air as it descends

Answer: D

Descending air warms and moves further from saturation rather than towards it. The other three each either lower the temperature towards the dew point or raise the dew point towards the temperature. Saturation is reached when the two meet, by whichever of the routes gets there.

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