Meisner Effect

[LyriiczBoii]

That is too cool to resist!

[ohgeeitsph4rrah]

@LyriiczBoii literally!

[mabraham1]

@FearMeexRawr - you can purchase LN2 and rent the required Dewar thermos at welding suppliers in most major cities. I live in Indianapolis, IN, and Airgas, Inc sold it to me for $15 + 50¢ a day.

[metamaterial]

Why does the nitrogen well up under the magnet as it does in 0:28 ? Is it avoiding the opposing field from the superconductor? Is it instead condensed oxygen? Is it a surface tension effect, as in tears of wine, from the gradient the comparatively warm magnet makes?

[TheRhinehart86]

What keeps it floating in the same spot and not flying all over the place?

[okodi]

@TheRhinehart86 The magnetic field. Imaging lines shaped the letter C going all around the center of the superconducting cylinder below looking a bit like an apple. As the cube falls into it, this shape is what is keeping it in the middle, just as water would be kept in middle cavity of the top of an apple.

[keoni29]

Pwning laws of sanity

[MrVegster]

Actually this is pinning, not Meissner effect. The Meissner effect pushes out all the magnetic field lines and therefore the superconductor levitation is completely unstable, as if it was another magnet with opposite polarity (north-north or south-south) balancing on top of the bottom magnet. See a video of a levitating train using pinning here: moebius dot youtube dot mosem dot eu ;-)

[AngelG12345123]

@MrVegster Your a dumbass. 

[monkofchina]

@AngelG12345123 YOU'RE a dumbass

[MeteorMan05]

@MrVegster No, this is a combination of the meissner effect and pinning. as well as quantum tunneling.

[loweshaw]

@MeteorMan05 This has nothing to do with quantum tunneling

[MeteorMan05]

@loweshaw Wrong. Look it up.

[loweshaw]

@MeteorMan05

Quantum tunneling is what allows atoms to do things such as initiate reactions at energies less than the activation energy as defined in classical mechanics. An example of this would be an electron with an energy of 150 keV passing through a coulomb barrier that would typically require 180 keV to penetrate. The principle displayed above is a combination of the meisner effect introduced when a material is passed into the superconducting state in the absence of a magnetic field.

[loweshaw]

@loweshaw

This introduced a repulsive effect between the magnet and the superconductor. Then by allowing the magnetic flux to pass through the superconductor by holding the magnet and the superconductor close, the magnet and the superconductor become both repelled and attracted. This is what is called flux pinning. The combined interaction of flux pinning and the meisner effect is defined as superconducting levitation. Quantum tunneling though constantly occuring during all interactions,

[loweshaw]

@loweshaw

plays no significant role in the behavior exhibited here. So maybe you know some terminology but im actually in nuclear engineering.

[MeteorMan05]

@loweshaw Well, I think you just corrected yourself. Quantum tunneling is occurring, as you said yourself. However, I think I am getting the mechanics confused between this ^ , a demonstration of the meisner effect, and applications of superconductors. Superconductors in the real life applications are usually applied as thin sheets in electronics, separated by another thin layer of some sort of insulator. Electrons are constantly tunneling through the insulator, which is what I'm referring to...

[MeteorMan05]

@MeteorMan05 ...but is not being showcased here. So excuse me and my mix up. ;)

[loweshaw]

@MeteorMan05 no worries man. what electronics do they use that kind of thing in? sounds cool

[MeteorMan05]

@loweshaw Well, MRI machines for one. Also, SQUIDs (superconducting quantum interference devices), also some new digital circuits, taking advantage of the 0 electrical resistance.

[PrimeTimePotato]

thats awesome

[ANMLgaming]

whats the puck made out of?

[KISSAproductions]

trippy 

[silverstirl7]

Cool Stuff

[demonwolfdawg]

thats some fucked up shit dude