Question

design an experiment to show that air contains water vapour

Answer 1

Take ice cold water in a metallic tumbler and keep it in open air.

(ii) After some time water droplets will be seen on the outer surface of the tumbler.

(iii)The water vapours present in air on coming in contact with the cold metallic surface of the
tumbler loses energy and gets converted to liquid state.

(iv) This shows that air contains water vapours.

Answer 2

Take out a bottle of water(cold) from the refrigerator and place it on the table. You will see small drops of water appearing on the outer surface of the bottle. This is because water vapour present in the air condenses and forms small drops of water. This activity proves that air contains water vapour