UPSC Prelims 2003·GS1·geography·climatology

A hydrogen inflated polythene balloon is released from the surface of the earth. As the balloon rises to an altitude up in the atmosphere, it will

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Last updated 23 May 2026, 3:31 pm IST
  1. ADecrease in size
  2. BFlatten into a disc-like shape
  3. CIncrease in sizeCorrect
  4. DMaintain the same size and shape

Explanation

The correct answer is C because of the relationship between atmospheric pressure and volume. As the balloon rises higher into the atmosphere, the external air pressure decreases. According to Boyles Law, when the external pressure on a gas decreases, the gas expands to occupy a larger volume. Therefore, the hydrogen gas inside the balloon exerts more outward pressure than the thinning air outside, causing the balloon to increase in size as it ascends.
geography: A hydrogen inflated polythene balloon is released from the surface of the earth. As the balloon rises to an altitude up

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