Amazing Physics - Someone explain this please? (no sound)

Kruposays...

sg, did you put "saved" in the tags, or was that automatic? Hmm... I assume it was you?

Hmm... and now I can't vote. How odd. Looks like it needs a save first.

As for explanation, the item becomes a super conductor only when cold. The meta-cafe page has some understandable explanations: http://www.metacafe.com/watch/55826/who_can_explain_this/

The goal of scientists is to create superconductors (i.e., no friction!) that work at higher temperatures, so that they can be used in more practical applications.

Farhad2000says...

The Meissner effect is the total exclusion of any magnetic flux from the interior of a superconductor, this happens here because of the introduction of nitrogen decaying the magnetic field to zero and producing perfect diamagnetism allowing the levitation of the iron placement on the object.

siftbotsays...

Saving this video from queue deletion, sending it to the top of the queue for one more try. Originally submitted on Sunday 17th September 2006 (save called by gold star member daphne)

rensays...

I think the shiney thing floats because the invisible magnetic field "wraps" around the levitating magnet because of a the special properties of the superconducting material beneath it that i understand is not a magnet at higher temperatures.

daphnesays...

Did this get discarded? I don't see a voting field any more, and it's in the "discarded" section.

I thought we saved this. Can an admin-type person look at this?

swampgirlsays...

Dearest Dag, James, Lucky, Ender, PMonkey, Horsujet...or any other admin. or someone with VS siftpowers,

After botching things up, Daphne tried to save it, yet here it is. Please put this video back? I would greatly appreciate it.

Thanks :-)

daphnesays...

hee hee hee

And let this be a lesson to all you too-soon-discarders! Just because it doesn't get votes immediately, it doesn't mean it won't get sifted. And then rise to the top 15.

But maybe it was the constant comments...who knows. Drama sells.

daphnesays...

Never underestimate the power of the underdog. ;-)

I have learned so much about what an audience wants by watching this group. Some sifts that I think will become legendary at VS never escape the queue...and others that I feel are so-so get to the top.

Conclusion: (in no particular order) Kittens, explosions, politics, science, and practical jokes involving farts and/or monkeys....

daphnesays...

"what a heartwarming story of the video that could"

I agree. Someone should make a video about it.

Ya, Krupo...isn't it great? No more searching around for the videos you like. w00t!

joedirtsays...

'shroomy, I had missed your "science" comment before. cold does not make things float. in fact almost every substance contracts when colder. (same weight & smaller volume means what?) so colder means more dense, and most things would sink when colder.

The oddity of water is that it expands when frozen. So it actually floats as ice. And yes, there is ice at the north pole, a lot more in antarctica. (Soon to be a year round unfrozen sea in the artic circle though, so you keep-on keeping on with your global warming is a myth story.) It's as solid as your grasp of science.




---------
no, it is a super-conductor.

most semi-conductors couldn't generate the kind of EM fields this does. the question is at what temperature can you make a material act like this, so this one is relatively high temp, liquid nitrogen (77K). It's probably an exotic material like Yttrium-Barium-Copper Oxide (Note the resistance goes down to zero).

Semiconductors are what make computers possible. Silicon and III-V materials are used because you can either make the device conduct electrons by applying a voltage, or it doesn't conduct when there is no voltage. That makes a possible 0's and 1's... and Intel Processors when you put a couple million of those devices (switches) together.

MycroftHomlzsays...

The Meissner effect is the total exclusion of any magnetic flux from the interior of a superconductor, this happens here because of the introduction of nitrogen....


This is wrong.

I actually work on superconductors. I think someone already posted the wikipedia article, so I don't know if you still want an explanation, but I can give you a pretty basic one. Let me know if you are game or if you think you got it.

siftbotsays...

Tags for this video have been changed from 'science, physics, experiment, magnet, saved' to 'science, physics, experiment, magnet, saved, superconductor, meissner effect' - edited by MycroftHomlz

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