Question

how would you demonstrate that water vapour is present in air

Answer 1

Keep a cold water bottle outside in the open area.
It will liquify the water vapors present in surrounding atmosphere.
You can see them on the surface of water bottle.

Answer 2

Answer:

a)Take out a bottle of soft drink from the refrigerator and place it on the table. b)Observe it for few minutes.

c)you will see small drops of water appearing on the outer surface of the bottle.

d) This is because water vapour present in the air condenses and forms small drops of water.

e) This activity proves that air contains water vapour.