Question

How will you show that water vapour is present in the air

Answer 1

U can see in it when ur travelling by car on the window.....

Answer 2

to show that water vapour is present in air take distilled water in a plastic bottle whose surface is dry. keep this in atmosphere for sometime and you will see that some water droplets are present on that bottle. this shows that water vapour present in atmosphere condenses on the surface of water bottle.