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A balloon is filled with a gas which is lighter than air. It is observed to rise in air up to a certain height.

      

A balloon is filled with a gas which is lighter than air. It is observed to rise in air up to a certain height. State a reason why the balloon stops rising.

  

Answers


John
At some height, the density of air is less than that at the ground. The upthrust on the balloon is equal to its weight and the resultant force on the balloon is zero.
johnmulu answered the question on February 18, 2017 at 10:13


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