A balloon filled with helium gas rises up into the sky, whereas a balloon filled with krypton gas goes down with a thud. Explain.

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Solution

Substances that are less denser than air will move upward while denser ones will move to the bottom.
Helium (He) gas is less dense than air.
So the balloon filled with helium gas rises into the sky.
The density of Krypton (Kr) is three times higher than that of the air.
As a result, a balloon filled with krypton gas goes down with a thud.

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