When you put a gas into a cylinder the particles move all over the place by a process called diffusion. Even though they have a different molecular weight, the heavier molecules do not settle at the bottom of the tank. You could take a sample of air from anywhere in the tank and it would be similar. This means it is homogeneous.
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No it is not by any means. it is atmospheric air compressed with the high amounts of carbons and other gases lowered or removed.