Question

why gas ballon are going in air​

Answer 1

It is filled with dihydrogen gas which is lighter then air. so it rises up.

Answer 2

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A gas balloon is a balloon that flies in the air because it is filled with a gas less dense than air or lighter than air (such as helium or hydrogen). It is tied to a thread to prevent it from flying up in the air. It is also sealed at the bottom to ensure that the gas doesn't escape.