4 ms·

Cool. It would be even cooler if they could make an "aerophobic" material so it floats in the air. Put some of it on the bottom side of a skateboard and you hav

• Dylan16807 7y ago
  It's fun to daydream about, but even if you could somehow warp surface tension to hold bubbles of vacuum against a surface, displacing air gives you less than 1/750th as much lift as displacing water.
  • deleted 7y ago
    [deleted]
  • dvdkhlng 7y ago
    Related link: https://www.o-boot.com/en/ https://www.o-boot.com/en/ s.a. https://en.wikipedia.org/wiki/Vacuum_airship https://en.wikipedia.org/wiki/Vacuum_airship
  • close04 7y ago
    Not the same principle really as these things float on water rather than in it. Things on water float at the boundary with the lighter air. If you want to do the same thing on air you should do it at the boundary with something else, even lighter. If you are completely engulfed in air you're like a diver underwater achieving neutral buoyancy, the same kind of thing as a perfectly balanced balloon. So you're floating in air rather than on air.
    • Dylan16807 7y ago
      > Not the same principle really as these things float on water rather than in it. Huh? Half the article talks about how they maintain buoyancy while submerged and why that's important. You don't need a boundary, and it wouldn't help you if you did. You still need to displace the same amount of air. The only way on/in makes a difference is if you have some way to prevent the fluid from going around you. You'd have to be tightly jammed inside a tube for that.