Question

A balloon filled with hydrogen gas rises up in the sky however a balloon filled with air fall down. Give reason
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Answer 1

Explanation:

Solution: A balloon filled with hydrogen rises to a certain height and more weight of air is displaced than the weight of balloon. But as it rises higher, the density of air decreases and upthrust becomes less and ultimately upthrust becomes equal to the weight of balloon and it stops riding further.

Answer 2

Explanation:

A balloon filled with hydrogen rises to a certain height and more weight of air is displaced than the weight of balloon. But as it rises higher, the density of air decreases and upthrust becomes less and ultimately upthrust becomes equal to the weight of balloon and it stops riding further