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Does gas comes in the effect of gravity?

Dear student!

If gravity did not work on gases then, the air particles could have been float away into space. It is the gravity which holds air and other gaseous particles in the atmosphere.

However the effect is not very strong due to the high randomness and energy in gases.

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 Gravity affects all matter, including gases. When gravity affects a gas, it reacts differently depending on its temperature. When air heats, it rises, when it cools, it sinks (convection). 

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NO.There are a couple of ways to explain this.First, because the atmosphere is a gas and because gases can be compressed, the atmosphere is denser at lower altitudes In a way the atmosphere is collapsed by gravity.

But more then that, because of the kinetic energy of the molecules of the atmosphere and because of their random notion, air molecules move in all directions including in opposition to gravity. When we observe this - and we can by watching larger particles in suspended in the air - we see what is called Brownian motion. You might find reading about this motion of interest in dealing with your question.
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