How much oxygen does a person consume in
a day?
The average adult at rest inhales and exhales
something like 7 or 8 liters (about one-fourth of a cubic foot) of air per
minute. That totals something like 11,000 liters of air (388 cubic feet) in a
day.
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.
A person who is exercising obviously
uses a lot more oxygen than that. You could determine how much air is moving
through your lungs by
exhaling into a plastic bag of known volume at each breath and seeing how long
it takes to fill the bag.
Here are some interesting links:
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