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
Funny story: not only is the air a (basically) Nitrogen/Oxygen mix, but humanity would not survive if it were very far off from the percentages given. See…humans need oxygen and don’t really do much with the Nitrogen, but nitrogen is required for plant health and is part of a support cycle involving CO2->O2 conversion. Without the Nitrogen that basically just takes up space (for animals), plant life would die out and there would be no mechanism for converting CO2 back into breathable oxygen. The balance of nature is an amazing thing.
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