Why does a helium balloon float when a regular one falls down?

Anything that’s lighter than air will float.

A liter of air at sea level weighs about 1.25 grams; a liter of helium, though, is only .18 grams.

Therefore the air sinks below the helium balloon, causing it to fly upward.

why does a helium balloon float when a regular one falls down
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Karen Hill is a freelance writer, editor, and columnist for zippyfacts.com. Born in New York, she loves interesting random facts from all over the world.