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Q.

Is it true that water is present in the air in the form of water vapour?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
As we know, that water is present in the air as water vapour. We can understand this with the help of an activity. Take ice-cold water or crushed ice in a dry tumbler. Allow it to stand undisturbed for some time in the atmosphere. It can be observed that tiny drops of water appear on the outer surface of the tumbler. The water vapour present in the air touches the cold surface of the tumbler. They lose their energy and get converted to water or the liquid state through condensation. These water droplets appear outside the tumbler. This activity proves that water is present in the air as water vapour.
 
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