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Rigorous Science

What would happen if the mass of air around earth doubled?

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So the mass of air around the earth has doubled. How it doubled isn't part of the question, but for the curious let's say a space station floating around earth processed all the nitrogen, oxygen, carbon, etc from some comets and pumped it down to sea-level. The process took a week to complete and the new gas temperature was at 15C(the earth-average). By the end, there was twice as much air(by mass) around the earth.

What I'm wondering is how this actually affects the earth. How much would the pressure increase(if any) and would the ground-level composition of the atmosphere change?

Any information helps, but I'm most interested in how the change would affect pressure and the balance of the atmosphere on the macro scale.

Thanks for your help!

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This post was sourced from https://worldbuilding.stackexchange.com/q/175550. It is licensed under CC BY-SA 4.0.

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