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Question
Why does the amount of water vapour decreases rapidly with altitude?
Short Note
Solution
The quantity of water vapour existing in the air depends upon the rate of evaporation and the temperature of the air which determines its holding capacity of water vapour. Both temperature and evaporation decrease with altitude and as a result water vapour also decreases rapidly with altitude.
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Evaporation and Condensation
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Chapter 11: Water in the Atmosphere - Exercises [Page 98]
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