4 ms·

That video isn't very convincing. The usual test is that the material can float above the magnet.

by XorNot 3y ago

deleted 3y ago
[deleted]
solarmist 3y ago
The effect is weak, but seeing that it behaves the same by flipping the magnet means that it can't be a standard magnet like we're used to seeing. (If I understood some of the other comments correctly). Other comments. https://news.ycombinator.com/item?id=36867758 https://news.ycombinator.com/item?id=36867758
- lilgreenland 3y ago
  Copper does this already. It's not like ferromagnets. https://www.youtube.com/watch?v=sENgdSF8ppA https://www.youtube.com/watch?v=sENgdSF8ppA
  - deleted 3y ago
    [deleted]
  - solarmist 3y ago
    In the video, it's when they stop moving the magnet, it maintains its position, neither repelling nor attracting. Several physicists have spoken up and said this, and a few other tells distinguishes it from any conventional materials, which is why they made the video to begin with I'm sure. That said I'm just parroting back the things I've picked up from this discussion.
    - piyh 3y ago
      Unmoving copper also neither repels or attracts a magnet. Eddy currents impede movement of non ferrous metals in a static magnetic field. This looks like slow motion falling or resistance to spinning when the metal is in a fixed field. This is how auto belays work. If you move the magnet, the metal will also move since you're inducing a current and the fields from the eddy currents will react against the moving magnet.
      - solarmist 3y ago
        > This is how auto belays work. That is super cool! That said, I'm enough of a layman not to be able to connect this explanation to what I saw in the video. Are you saying because it wasn't moving in "slow motion," we can rule out non-ferrous metals? Or are you saying the alternating movement/stillness of the magnet shows this?
    - lilgreenland 3y ago
      When does the hanging copper maintain a position in the video? https://www.youtube.com/watch?v=EtVjGWpbE7k https://www.youtube.com/watch?v=EtVjGWpbE7k All I see is the normal dampening and dragging effects that I show in my physics classroom.
      - solarmist 3y ago
        As I've said, I'm fuzzy on the details, so I'm relying on the expertise of the physicists here. I can tell it doesn't react to a magnet in ways that I'm familiar with (copper, iron, other magnets), but that's all the detail I can tell from the video.
  - lilgreenland 3y ago
    Well after seeing the second video I'm pretty convinced it's superconductive or a good scam. The effect was probably just not strong enough in the first video.
    - XorNot 3y ago
      I'm suspicious of the magnet. Take a real close look in the second video: the paper cuts the image so the seam of the magnet blends with the table. But in the video it looks much more obviously like there's two magnets stacked on top of each other. Which is a weird thing to do when for superconductors you shouldn't need it, but for pyrolytic graphite levitation you would (to get an N-S pole).
  - XorNot 3y ago
    It's also suspicious that there's not a control sample of copper in the video. Any scientist trying to be thorough would have controlled for this - shown that you don't get the same effect with just a copper sample as you do with a copper sample that's been coated.
- carabiner 3y ago
  If this enables monopole magnets?
  - solarmist 3y ago
    That's one tell. There are several tells that, in combination, mark it as a super conductor. But I'm just parroting back what the physicists in the thread have shared, so I might have some details wrong.
deleted 3y ago
[deleted]
floxy 3y ago
This is the better video: https://sciencecast.org/casts/suc384jly50n https://sciencecast.org/casts/suc384jly50n
- jiggawatts 3y ago
  That looks like a chunk of pyrolytic carbon, which can also float above a magnet.
  - XorNot 3y ago
    AFAIK doesn't pyrolytic carbon need a N-S field in order to levitate? That's the one key difference I can see - this looks like the traditional superconductor trick of just levitating in a simple field. i.e. not like some of the ones you'd see here: https://www.youtube.com/watch?v=Vy9uWXgbKy0 https://www.youtube.com/watch?v=Vy9uWXgbKy0
    - achr2 3y ago
      Not if a corner is anchored, as is visible in their video. This is an obvious scam.
      - XorNot 3y ago
        This video seems to show the best example of a possible effect like that: https://www.youtube.com/watch?v=VC3r9-OaWes https://www.youtube.com/watch?v=VC3r9-OaWes But it still looks dependent on their being a NS pole at a corner. That said...from this video https://sciencecast.org/casts/suc384jly50n https://sciencecast.org/casts/suc384jly50n I'm very suspicious of the behavior you see in the last few seconds where it gets pushed over to the corner and seems to fall right to the magnet That would be consistent with their being a ring magnet underneath the top magnet their, and once suitably over into the corner it loses the diamagnetic property because there's no N-S pole. The "seam" on what should be a bulk magnet in both videos that are out seems like an obvious problem. So yeah...I think put me down for this is diamagnetism with pyrolytic carbon (the image in the paper also notably hides what you see in the video - that there's a seam on the magnet where it looks like it's a stack of two).

That video isn't very convincing. The usual test is that the material can float above the magnet.

by XorNot 3y ago

That video isn't very convincing. The usual test is that the material can float above the magnet.

deleted 3y ago

[deleted]

solarmist 3y ago

The effect is weak, but seeing that it behaves the same by flipping the magnet means that it can't be a standard magnet like we're used to seeing. (If I understood some of the other comments correctly). Other comments. https://news.ycombinator.com/item?id=36867758 https://news.ycombinator.com/item?id=36867758

lilgreenland 3y ago
Copper does this already. It's not like ferromagnets. https://www.youtube.com/watch?v=sENgdSF8ppA https://www.youtube.com/watch?v=sENgdSF8ppA
- deleted 3y ago
  [deleted]
- solarmist 3y ago
  In the video, it's when they stop moving the magnet, it maintains its position, neither repelling nor attracting. Several physicists have spoken up and said this, and a few other tells distinguishes it from any conventional materials, which is why they made the video to begin with I'm sure. That said I'm just parroting back the things I've picked up from this discussion.
  - piyh 3y ago
    Unmoving copper also neither repels or attracts a magnet. Eddy currents impede movement of non ferrous metals in a static magnetic field. This looks like slow motion falling or resistance to spinning when the metal is in a fixed field. This is how auto belays work. If you move the magnet, the metal will also move since you're inducing a current and the fields from the eddy currents will react against the moving magnet.
    - solarmist 3y ago
      > This is how auto belays work. That is super cool! That said, I'm enough of a layman not to be able to connect this explanation to what I saw in the video. Are you saying because it wasn't moving in "slow motion," we can rule out non-ferrous metals? Or are you saying the alternating movement/stillness of the magnet shows this?
  - lilgreenland 3y ago
    When does the hanging copper maintain a position in the video? https://www.youtube.com/watch?v=EtVjGWpbE7k https://www.youtube.com/watch?v=EtVjGWpbE7k All I see is the normal dampening and dragging effects that I show in my physics classroom.
    - solarmist 3y ago
      As I've said, I'm fuzzy on the details, so I'm relying on the expertise of the physicists here. I can tell it doesn't react to a magnet in ways that I'm familiar with (copper, iron, other magnets), but that's all the detail I can tell from the video.
- lilgreenland 3y ago
  Well after seeing the second video I'm pretty convinced it's superconductive or a good scam. The effect was probably just not strong enough in the first video.
  - XorNot 3y ago
    I'm suspicious of the magnet. Take a real close look in the second video: the paper cuts the image so the seam of the magnet blends with the table. But in the video it looks much more obviously like there's two magnets stacked on top of each other. Which is a weird thing to do when for superconductors you shouldn't need it, but for pyrolytic graphite levitation you would (to get an N-S pole).
- XorNot 3y ago
  It's also suspicious that there's not a control sample of copper in the video. Any scientist trying to be thorough would have controlled for this - shown that you don't get the same effect with just a copper sample as you do with a copper sample that's been coated.
carabiner 3y ago
If this enables monopole magnets?
- solarmist 3y ago
  That's one tell. There are several tells that, in combination, mark it as a super conductor. But I'm just parroting back what the physicists in the thread have shared, so I might have some details wrong.

deleted 3y ago

[deleted]

floxy 3y ago

This is the better video: https://sciencecast.org/casts/suc384jly50n https://sciencecast.org/casts/suc384jly50n

jiggawatts 3y ago
That looks like a chunk of pyrolytic carbon, which can also float above a magnet.
- XorNot 3y ago
  AFAIK doesn't pyrolytic carbon need a N-S field in order to levitate? That's the one key difference I can see - this looks like the traditional superconductor trick of just levitating in a simple field. i.e. not like some of the ones you'd see here: https://www.youtube.com/watch?v=Vy9uWXgbKy0 https://www.youtube.com/watch?v=Vy9uWXgbKy0
  - achr2 3y ago
    Not if a corner is anchored, as is visible in their video. This is an obvious scam.
    - XorNot 3y ago
      This video seems to show the best example of a possible effect like that: https://www.youtube.com/watch?v=VC3r9-OaWes https://www.youtube.com/watch?v=VC3r9-OaWes But it still looks dependent on their being a NS pole at a corner. That said...from this video https://sciencecast.org/casts/suc384jly50n https://sciencecast.org/casts/suc384jly50n I'm very suspicious of the behavior you see in the last few seconds where it gets pushed over to the corner and seems to fall right to the magnet That would be consistent with their being a ring magnet underneath the top magnet their, and once suitably over into the corner it loses the diamagnetic property because there's no N-S pole. The "seam" on what should be a bulk magnet in both videos that are out seems like an obvious problem. So yeah...I think put me down for this is diamagnetism with pyrolytic carbon (the image in the paper also notably hides what you see in the video - that there's a seam on the magnet where it looks like it's a stack of two).