Multiple choice general knowledge sports

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

  1. decrease in size

  2. flatten into a disc-like shape

  3. increase in size

  4. maintain the same size and shape
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As a hydrogen balloon rises, atmospheric pressure decreases significantly. The balloon is flexible, so the gas inside expands against the decreasing external pressure, causing the balloon to increase in size until the material can no longer stretch.

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