how will you show that air contains water vapour?

When the salt is kept in air for a long time , it gets wet. It shows that air contains water vapours.

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Take a bottle containing cold water out in the hot. after some time you will notice droplets of water around it. the cold surface of the bottle condenses the water vapour present around it into water droplets. this activity proves that air contains water vapour.

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write two application of evaporation?

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if you take a pot and keep it in sunlight

after sometime you will see that there is less water in the pot.

This activity proves that air contains water vapour

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