Question

write an activity to show that air contains water vapour?

Answer 1

evaporation shows that

Answer 2

Hey buddy here's your activity :-- ☺
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Take ice cubes in a beaker and keep it open place for some time. You will notice that around the beaker there are some water droplets. These droplets formed are due to condensation of water vapor present around the beaker. This confirmes the presence of water vapour in air.

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Hope it hells you☺
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Keep smiling☺