@futurebird @mcc
While we don't know what happens in long-term non-Earth gravity (other than 0g), I wonder if air composition will end up being a good guide
In the early US program, they used pure oxygen at low pressure. In Skylab, they already had to use ¼ nitrogen. Today's NASA standards specify at least ½ nitrogen (or other inert gas), and in practice everyone uses standard air, with ⅘ nitrogen
https://rants.au/@sabik/113605436379431513
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