Question

balloone filled with hydrogen and helium rises in the air .give reason. ​

Answer 1

A gas balloon is a balloon that rises and floats in the air because it is filled with a gas lighter than air (such as helium or hydrogen). When not in flight, it is tethered to prevent it from flying away and is sealed at the bottom to prevent the escape of gas.

Answer 2

Answer:

Balloon filled with hydrogen and helium rises in the air because these gases are lighter in weight.

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