How much atmosphere compressed to make oxygen pleass help me

500 ft3 (14.16 m3) of air

Explanation:

To obtain this oxygen, the person will breathe approxi- mately 500 ft3 (14.16 m3) of air.

By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.

first thing first of the answer is with technology. second thing second thing is that the big bang theory did not happened u see they say it did but what they dont realize is that like dinasures are still a round they might deny it but they and look at these 12 foot human skelteons they find lets see didnt the bible say something about giants. hope this peace.