8 ms·

Hydrogen is the second most abundant element in the universe..

• clock_tower 11y ago
  Also absurdly flammable -- the Hindenburg was flying on hydrogen. I certainly wouldn't want to be in a hydrogen-filled airship floating above a forest fire! (Helium would work better, but I think it gets pretty expensive.)
  • astazangasta 11y ago
    You don't need a gas. Just use fixed-frame volumes made of, say, graphene layers and fill it with vacuum. As long as your frame can hold the required force, no problem. There might even be metallic foams that do the trick.