Question

The balloon does not rise indefinitely. Give reason.
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Answer 1

Since the density of air decreases with height therefore the balloon halts at a particular. height where the density of air is such that the weight of air displaced is just equal to the weight of helium gas and the balloon. Hence the net force acting on the balloon is zero and the balloon stops rising.

Answer 2

Answer:

A balloon filled with helium does not rise in air indefinitely but halts after a certain height. ... When a balloon is filled with helium, there is an inner pressure because of which the balloon expands more and more as it goes higher. But as the balloon goes higher, the atmospheric pressure also decreases.

Explanation:

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