Why does the amount of water vapour decreases rapidly with altitude ?

1.	Why does the amount of water vapour decreases rapidly with altitude ?
Answer» Solution :The quantity of water vapour existing in the air depends upon the rate ofevaporation and the temperature of the air which determines its holding CAPACITY of water vapour . Both temperature and evaporation DECREASES with altitude and as a RESULT water vapour also decreases RAPIDLY with altitude.

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