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A comment on If CO2 was a visible gas.
At first I wondered, "Wouldn't the air be all purple normally?" Turns out my memory of the atmosphere levels were wrong.
> By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases.
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At first I wondered, "Wouldn't the air be all purple normally?" Turns out my memory of the atmosphere levels were wrong.
> By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases.