if you can make an arbitrarily large rigid structure contain less air pressure than its surroundings, you could nest them to create a vacuum airship
I guess worst case maybe the gas bag starts leaking argon into the cabin and you asphyxiate but I'm not sure how real of a risk that would be
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physics book sez "the average translational kinetic energy per molecule depends on on the temperature, not the pressure, volume, or kind of molecule"
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