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Hot air balloons use hot air. They have a burner to heat the air. Hydrogen balloons were too dangerous because hydrogen is highly flammable, even static electricity could cause an explosion. Helium is safer because helium is not flammable.

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Related Questions

Why do helium balloons float better than just air balloons?

helium is less dense than air. :) so helium will float better than air


Why is helium better for balloons or lifting instruments?

Helium is lighter than air, hence it will rise up in air, making things fly.


When balloons are filled with this they are lighter than air?

Hot air, hydrogen or helium are lighter than cold air.


How do helium balloons float in the air?

Helium balloons float in the air because helium is lighter than the surrounding air. This causes the balloon to be buoyant and rise upwards.


Why do helium-filled balloons float up in the air?

Helium is lighter than air.


Why will helium filled balloons float in the air?

Because helium is lighter than air.


Which gas is used to fill the balloons?

Hydrogen, until the Hindenburg,then everyone realized that "Hey, Hydrogen isn't that safe to use!"Hot air balloons, you mean?? Just air that is hot.Actual hand balloons and such? Helium or again, just air. Helium floats better because it is lighter than the surrounding air around it. Helium and air are still used in both.


What is the difference between having helium in a balloon and having air in a balloon?

Helium is lighter than air, so a balloon filled with helium will float. In contrast, air-filled balloons will sink because the density of air is greater than that of helium. Additionally, helium balloons will deflate faster than air-filled balloons due to its smaller molecular size.


Why does a helium balloom float in air?

Helium is lighter than air. so balloons filled with helium will float in air


Why do helium filled balloons float upwards but air filled balloons drop down?

bcoz helium is lighter than air


Why do helium balloons float and you don't?

because helium is lighter than 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