Ascending Balloon

The density of helium is lower than that of air. As a result, when a helium balloon is released, it floats up into the sky (see buoyancy).

What happens to the volume of the helium balloon as it rises up?


  • the balloon is made of an excellent thermal insulator, so no heat enters or leaves the balloon;
  • the balloon is tied properly so that gases cannot enter or leave the balloon.


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