why does a balloon which contains hydrogen rise up in the air and a balloon containing air does not?i know the answer but i would like a proper answer that would fetch me full 1 or 2 marks.

Asked by Vidur | 18th Feb, 2014, 10:07: PM

Expert Answer:

Hydrogen being lighter than air, the weight of air displaced by hydrogen ballon is greater than the weight of hydrogen. Therefore, the buoyant force on the the hydrogen balloon is greater than its weight and hence it rises up. But balloon containing air is heavier than air thus the buoyant force on it less than its weight and hence it does not rise.

Answered by  | 20th Feb, 2014, 01:44: PM

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