Question

55. How will you demonstrate that water vapour is present in air ?
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Answer 1

Take a beaker containing ice .When you bring this in contact of air, after sometime we may observe water droplets on its surface .It conveys that water vapour present in air converts into water(liquid) due to its condensation.

Answer 2

take out a bottle filled with cold drink or cold water out of refrigerator you will observe some water on the surface of the bottle these are formed due to water vapour as water vapour (gas) got in contact of cold surface(bottle) it get converted into water(condensation)

This proves water vapour is present in air