A balloon filled up with gas would only go up in air if it is filled up with _____.

A gas whose density is lower than air

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A gas whose density is higher than air

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Cold air

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Water vapour

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Solution

The correct option is A A gas whose density is lower than air
A balloon filled up with gas would only go up in the air if it is filled up with a gas whose density is lower than air as the fluid with higher density always settles down.

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