[coffeebean]

Originally Posted by algi45

In sixth grade science classes, one should learn that air is mostly nitrogen and that's the stuff we're breathing.

Earth's Atmosphere: Composition, Climate & Weather | Space

Excerpt from the above linked article.........

Composition of air

According to NASA, the gases in Earth's atmosphere include:

Nitrogen — 78 percent
Oxygen — 21 percent
Argon — 0.93 percent
Carbon dioxide — 0.04 percent
Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor