Comment by numpad0

9 hours ago

Airships have air bags inside. Same deals as submarines. They take in and out ambient stuff into the bags to control buoyancy.

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numpad0

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dotancohen  5 hours ago

What ambient stuff is available at the altitude where a zeppelin typically flies?

  • numpad0  2 hours ago

    so balloons appear to have negative mass, it's actually just the result of having lower density than the air. the upward force balances out with the gravity where the lbs/in^3 figure of its entirety matches that of ambient air. it's exactly the same as how an empty tank underwater floats, and a water filled tank underwater sinks.

    or I guess one could say it's the bottom side getting more compressive load from air than the topside, given the observable effect, whatever floats our zep...