How many molecules of oxygen do breathe in in one breath?

The average pair of human lungs can hold about 6 liters of air, but during normal respiration, only about 500 mL (one half of a liter) is inspired.

Oxygen makes up 21% of air.
There are 2.7 x 1019 (2,751.3) molecules in every cubic centimeter of air.

0.5 liter (500 cubic centimeter) contains 1,375,650 molecules, 21% of which are 288,886.5 oxygen molecules.

(see Composition of Air)

Tags: science

Last update:
2007-12-10 14:31
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Chuck Norris has counted to infinity. Twice.

Comment of me:
hi, actually there are 2.7 x 10^19
molecules = 27,000,000,000,000,000,000 molecules
per cubic centimetre of air. ... show more
Added at: 2008-01-19 23:01