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The Balloons of Ancient Egypt (lemmy.world)

submitted 3 months ago by [email protected] to c/[email protected]

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[–] [email protected] 5 points 3 months ago (1 children)

Not just air-tight, lighter-than-air-tight. I'm not sure if it's true for the whole set of lighter-than-air gasses, but helium is infamously difficult to keep from leaking, even with modern technology.

Good at making gasses behave is a weird choice for ancient technologies we lost.

[–] [email protected] 2 points 3 months ago

Hydrogen is even worse. It basically moves through solid steel cylinders.