How will you demostrate that water vapour is present in air?

1.	How will you demostrate that water vapour is present in air?
Answer» Take ice cold water in a glass tumbler. We will wait for sometime. We will observe that water droplets are formed at the outer surface of the glass tumbler. It shows that there are water vapour in air, on coming in contact with cold glass of water. Vapours loses energy and gets converted into liquid state which we see in the form of water droplets. Air containing water vapours which get condensed by coming in contact with cold surface of glass. So it is proved that there are water vapours in air.

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