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Unsaturated air rises 1 km. By approximately how much does it cool?

  • A.about 2 degrees Celsius
  • B.about 20 degrees Celsius
  • C.about 10 degrees Celsius
  • D.about 6 degrees Celsius

Answer: C

The dry adiabatic lapse rate is close to 9.8 degrees Celsius per kilometre and applies to any unsaturated parcel regardless of how much vapour it carries. It is a consequence of expansion alone rather than of the humidity of the air.

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