You know like the kind that go on a window or bathroom mirror or on the wall or in the shower. They need the atmosphere pushing down on them to work, right?
Correct, they require air pressure to work.
Could work inside a spaceship/station.
ActionLab tested it on YouTube:
If by “in space” you mean in zero-G inside a spacecraft, yes. If you mean in a vacuum, no.
So you’re telling me a space octopus would be powerless ?
I believe they call those “Elder Gods” or “Great Old Ones.” They are far from powerless.
Other than the fact that it’s an octopus that managed to survive and thrive in outer space, yes.
Yes. They won’t work because they operate on a difference in air pressure providing a force. No air? No force. Same reason an airplane wing won’t provide lift in the upper atmosphere.
But, compare to a rocket engine that does NOT need an atmosphere to push against.
Just a technicality, but the Casimir effect would still provide some adhesive force. It would be greatly reduced vs a suction cup in an atmosphere, but it wouldn’t be 0 force.
Though in microgravity, it might be enough to stick something to a surface, as long as it’s not getting bumped or jostled. And don’t expect it to stay in place if you need to do a maneuvering burn.
Edit: fixed word
Yes the Casimir Effect.
Any good answer to a high school science question begs for a graduate level rebuttal.
Ah thanks for the spelling, swipe typing had Kashmir already so I thought that was right. Corrected above.
And yeah, even in high school I was lucky to have a physics teacher that liked delving deeper into the topics than what’s normally done at that level because my mind seems to naturally seek out those edge cases where rules as given break down. Still hoping we find one of those cases for the laws of thermodynamics lol.
Phrases I did not expect to think this early in the morning: "what’s the rocket engine of suction cups?”
Velcro, or maybe Van Der Waals force, or maybe whatever the hell makes gauge blocks stick to each other.
If it’s metal, just rub a bit of it against another piece of metal and it will cold weld/fuse to it.
I like the gauge block notion. A (quick) search says that it’s a combination of surface tension from the oils they’re coated in, suction (gone for us), and the super flat surfaces slightly exchanging electrons and bonding in close proximity.
I’m a fan of the surface tension angle as the “rocket of suction cups”, since it’s got that “non-binding force” element, where welding or glue feels different, and Velcro feels like a tangle.
It’s “pull-y” where suction is “push-y”.
Now the question is would surface tension grab something in a vacuum the way it does outside of one. I know you’d have water sublimate off, so it’s questionable to me.
