Question

how can you show that water vapour is present in air

Answer 1

take a glass and pour cold water .
then we see the small drop of water
on the outer side the glass.
when we pour cold water in the glass
water vapour in the air is convert in liquid .
hense, the water vapour present in air..

hope it helps ..

Answer 2

1.How can you say that water vapour is present in air?

Ans please see the activity