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ICSE Class 8 Answered

What are necessary conditions for evaporation? How does water vapour play.an important role in daily weather changes
Asked by glungphi | 22 Nov, 2019, 06:05: AM
answered-by-expert Expert Answer
Hint
Heat is a necessary condition for evaporation to take place. 
 
Role of Water vapour-
As the temperature of the Earth surface and atmosphere increases, more water vapour is held in the atmosphere and ultimately it rains down. Water vapour is lighter than air and rises from wet places. It also cools down while rising and produces clouds that gradually condense in rain. Heat is released during condensation producing more updrafts, pressure and winds.
 
NOTE - It is also a greenhouse gas and absorbs the thermal radiations. As temperatures go up, the air will hold slightly more vapour, and that in turn traps more heat. The amount of vapour can be calculated with some standard techniques.
Answered by | 22 Nov, 2019, 01:32: PM
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