Question

How can we say that air contains water vapour?

Answer 1

air contains water vapour we can determine this by studying about the water cycle..in which the air which contains water vapour helps in cloud formation...and when the amount of vapour is high or totally saturated it starts raining...!!!

hope it helps...!❤

Answer 2

We can say that air contain water by doing particluar experiment that is

Take a cold water in tin glass keep it in surrounding and observe it after few min. there will be water droplets on surface of glass this proves there is eater vapour in air