Aug 14
What humans exhale during each breath, a bit misleading
by  Retherford, Cory Patrick on 8/14/2012 6:48 PM

It may be surprising that when I say we breathe out a very small amount of carbon dioxide, very small!

Of all the elements we exhale, carbon dioxide (4%) and argon (1%) are among the smallest trace elements.
The reality is that when we exhale we roughly exhale 78% nitrogen, 17% oxygen which is why rescue breathes are so effective during emergency first response using CPR.

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