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The air you exhale normally contains 19% less oxygen than inhaled air, with a 4% to 5% level of carbon dioxide and other gases, along with added water vapor. (Which is why you can rebreathe it to control "hiccups".) Your body will continue to remove the remaining oxygen and add more carbon dioxide until the exhaled air is almost all nitrogen and CO2.

So if you had only this air to breathe, your body would not be able to keep functioning and you could pass out and eventually die. This is the same situation as when one or more persons are trapped in a closed space with a limited amount of air.

The considerable oxygen content (17%) in exhaled air allows mouth-to-mouth resuscitation in CPR.

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15y ago

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