The virtue of air having weight gives us the atmosphere
The role of gravity in climate and weather is for the main part founded on its influence in most sections of atmospheric physics. For a planet to have life supporting climate, it should have in the constitutions of the atmospheric fluids, oxygen. This only forms part of the gaseous composition of the earth.
In the hearachy of matter by their atomic weight, the lightest elements always occupy the top in any buoyant situation while the heavy elements take the bottom part. For this reason, the gasses in the atmosphere also arrange themselves in the same order. Thanks to the virtue of air having weight, gravity holds it in place to give us the atmosphere.
Although there are several factors which determine atmosphere in a planet, the lower the gravity the weaker the atmosphere and with time the atmospheric blanket fizzles out at a rate relative to the size of the planet.
Similar reading;
