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If you blow up a balloon then the helium inside it will run out after about 2 days. After those two days (maybe 3) there will be no helium left, but you will find that the balloon is still up and rounded but not as big as before. This is because the helium had got warm inside the balloon and transfered into a liguid, then that got evaporated and turned to a gas. Therefore the gas isn't helium. Because as it changed to a liquid, the liquid picked up other parts of gas and that transfered to a liquid with it to. So it is just an ordinary gas, Oxygen. Thank You. Lucie

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15y ago
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4mo ago

A balloon filled with helium rises until it reaches a point in the atmosphere where the surrounding air has the same density as the helium inside the balloon, thus resulting in neutral buoyancy. Once this equilibrium is reached, the balloon will stop rising and remain at a stable altitude.

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13y ago

bcoz ,,,,after reaching a certain height d pressure of d gas inside the balloon bcomes higher or larger than than the pressure outside the balloon......so the pressure inside it tries 2 come out and as a result it bursts.....

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13y ago

It will stop rising when one of two things occur:

  • The balloon burts because the atmospheric pressure on the outside is signifcantly less that the balloons internal pressure.
  • If the former does not occur, the balloon will stop rising when its bouyant force is equalized. Because Hellium is lighter than air, it will float on top of air. Once it reaches the "surface" of air, it will stop rising.
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10y ago

It is because helium is a stable gas whose valency is zero and it is in duplet state.Moreover it is nonreactive.So,when it rises up it cannot combine with other gases and it becomes stable.Thus,it stops.

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14y ago

Because the atmosphere doesn't extend indefinitely. It gets thinner and thinner as you go up.

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Q: Why Balloon filled with helium does not raise indefinitely?
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