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because helium weighs 4u and air (80% nitrogen) weighs about 14u. because helium has less mass, it has less gravity and rises. it has also to be a gas as a substance in a gas form has a much lower density as a liquid or solid form. earlier they used hydrogen (1u), but that is highly explosive.
(u is relative mass for atoms)
Wiki User
∙ 9y ago
Wiki User
∙ 11y agoThe gas helium is used to fill balloons for parties and events. It is lighter than oxygen, and if you are not careful, your helium filled balloon will float away into the sky.
Wiki User
∙ 11y agoHook it up to a tank of Helium, turn the valve, let some into the balloon.
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What makess up helium balloons?
helium is generally filled in helium balloons
Is helium suitable for blowing up balloons?
Yes, balloons filled with helium will be buoyant in air
Are helium filled balloons flammable?
No. Helium is non-flammable.
Why the balloons are called helium?
Balloons are not called helium; they can be filled with helium because this gas is not flammable and has a very low density.
What happen when a balloon is filled with helium?
Helium is lighter than air and a balloon filled with helium may rise up.
What makess up helium balloons?
helium is generally filled in helium balloons
What are balloons that float filled with?
Helium
Is helium suitable for blowing up balloons?
Yes, balloons filled with helium will be buoyant in air
Are helium filled balloons flammable?
No. Helium is non-flammable.
Why are balloons called balloons?
Balloons are not called helium; they can be filled with helium because this gas is not flammable and has a very low density.
Why do helium filled balloons float upwards but air filled balloons drop down?
bcoz helium is lighter than air
Why the balloons are called helium?
Balloons are not called helium; they can be filled with helium because this gas is not flammable and has a very low density.
Is hot air balloons filled with helium?
No, it is filled with heated air.
What is helium mostly found in?
In helium balloons and blimps. Helium is lighter than air. So balloons or blimps filled with helium will float or rise up
When balloons are filled with this they are lighter tha air?
Helium.
What gas are balloons filled with to make them float?
Helium
How do the Macy's thanksgiving parade balloons float?
Those balloons are filled with helium gas. Helium is lighter than air. Helium is a noble gas.
