What element is used in some balloons?

Answer 1

Helium.

Because helium is much lighter than air, helium balloons float in the air; however, because helium consists of smaller particles than air, the balloons lose air faster.

Why are you not at risk of being poisoned by helium gas? As an extra bonus, you can use helium balloons to clear your lungs by breathing the contents in and out, which will make you speak in a funny falsetto voice.

Because hot air has a much larger volume than cold air, hot air balloonists simply use regular air and heat the inside of the balloon with a gas furnace to create a buoyancy effect.

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Answer 2

Kai Bowman

Helium is used in some balloons.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.