A balloon with hydrogen in it rises up but a baloon with air come down. Why
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density of hydrogen is less than density of air
or
hydrogen is lighter than air
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Hydrogen is very less dense compared to air. ... (i)
So a balloon displaces a volume of air equal to the volume of balloon. Therefore by Archemedes' Principle, the bouyant force is equal go weight of air displaced. Now the weight of air > weight of helium balloon of same volume ( because of (i) ). Therefore, there is an upthrust and hydrogen balloon rises up. A balloon with air comes down as the weight of the balloon > weight of air displaced (note that balloon has rubber outer part, which is quite significantly denser than air)
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