Today’s [Triviatime](https://triviatime.app/) had a Q which asked what % of the earth’s air is made of Oxygen. The answer was 21% but this only left me with more questions!
How??? What else is there and what are the implications of those elements/things being literally everywhere in the air. Fellow laymen eggheads, please add to this list of thoughts you have about this which need to be addressed:
– How does our breathing filter the other stuff out?
– What actually is air if it’s made up of so many different things, I thought air basically = oxygen?
– How steady is this 21% level? Can this change overtime, is that dangerous, and if so how?
– Etc
In: 0
Air is made almost entirely of Nitrogen, an inert gas. Then oxygen, then water vapor, then carbon dioxide, then argon and other trace elements.
Your body only makes use of the oxygen. The rest of it you just breathe back out.
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