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I suppose because we don’t really use the nitrogen - it’s inert, unlike oxygen which is part of vital respiration. I’m no expert but it’s conceivable some other mix of gases could work as the inert portion besides nitrogen, but oxygen is required. Seems like it would take a lot of luck to find the right concentration though.
Calling it "inert" is misleading. It's involved in all kinds of chemical reactions that are essential for life (and lots of non-biological reactions, too). It's only inert in the sense that most living things can't use it directly from the air and rely on nitrogen-fixing plants and bacteria to make it into molecules we can use.
Sure, I understand it’s one of the 3 basic plant fertilizers and plays a role in human biology. I’m referring nitrogen as a gas and its role in human respiration. It’s commonly referred to as an inert gas. I think that mainly refers to respiration and combustion.
Now I'm imagining a planet with a helium atmosphere that's breathable for humans. Best. Episode. Of. Star Trek. Ever. I'm envisioning TOS, super serious scenes where Scotty has fallen near dead, Kirk looks to Bones for some reassurance, and in Mickey Mouses voice Bones mournfully tells him "He's dead, Jim"
This needs to be an episode of Lower Decks.
e: and Boimler’s voice doesn’t change.
I think it could work? Not really sure. Probably sound enough scientifically for a 1st gen Star Trek episode.
It would work in the sense that you could breathe it. It would not work in the sense that the gravity of a planet that actually holds a helium atmosphere (as opposed to it flying off into space) would be uncomfortable.
Would argon work?