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I think that you may have left out a zero.
I live at 3700 feet and breathe quite well.
If it was 30,000 then it would be hard to breathe because at Mount Everest the air is thin. Gravity holds the air next to the ground and it begins to be thin on top of that very high mountain. So, think of air as a liquid that rests on the earth. It is only so thick ad then there is none in space.

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15y ago

What else can I help you with?