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Rahila Ahmed
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Posted 5 year ago
Rahila Ahmed 
How much oxygen does a human need?
2 Answer(s)
Nikku Yadav
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Posted 5 year ago Nikku Yadav

How much oxygen does a person need? A human breathes about 9.5 tonnes of air in a year, but oxygen only makes up about 23 percent of that air (by mass), and we only extract a little over a third of the oxygen from each breath. That works out to a total of about 740kg of oxygen per yea
Seema Kumari
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Posted 5 year ago Seema Kumari Gurushala Teacher Coach

The air that is inhaled is about 20-percent oxygen, and the air that is exhaled is about 15-percent oxygen, so about 5-percent of the volume of air is consumed in each breath and converted to carbon dioxide. Therefore, a human being uses about 550 liters of pure oxygen (19 cubic feet) per day.