give reason:
a balloon dies not rise indefinitely
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Explanation:
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. This is why the balloon ultimately stops after reaching a certain height.
Answered by
1
Answer:
The reason is that the density of air decreases with altitude. Therefore as the balloon gradually goes up, the weight of the displaced air ( i.e., upthrust ) decreases. It keeps on rising as long as the upthrust on it exceeds its weight. When upthrust becomes equal to its weight, it stops rising further.
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