What's the best tag for the gas mixture that humans and animals breathe inside spacecraft, or one that they don't?
atmosphere's definition says it's the stuff around planets.
Questions regarding an envelope of gasses surrounding a celestial body held in place by the body's gravity.
I just added air to How much nitrogen did Skylab and the Space Shuttle carry for atmosphere makeup? but I'm not sure if it's the right way to go.
note: Now I'm also wondering about atmospheres in spacecraft that are not crewed and do not contain animals: