Buyer's Guide: Grades of Magnets

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Beer, vodka and magnets? Sounds like the recipe for disaster but that's what I'll use to explain grades of magnets!
It's important to know about grades when shopping for neodymium magnets. In this video I tell you about the basics of it and compare the powers of ferrite- and neodymium magnets. Feel free to ask questions if you need help or in doubt.
Music credit for the outro:
'Junkyard Tribe' by Kevin MacLeod
ISRC: USUAN1200021
incompetech.com...
English captions available - just press CC under the video. Danish captions coming soon...

Опубликовано:

6 окт 2024

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Комментарии : 171

@brainiac75 11 лет назад

Thank you very much! I've always loved science and have never understood why so relative few people are interested in it. I try to share my fascination of it and hope people can see that science can appeal to most people. Luckily it looks like people are beginning to realize that there's more to RU-vid than just music videos and people failing ;)

@jenniferreynolds9521 3 года назад

Hello

@sitarnut 11 лет назад

Best Channel on RU-vid for making things clear about science. Wish you a long and fruitful career as an educator of folks who've been curious about science since junior high school. Love the common sense and humor put into your demonstrations. Wish that it was mandatory for all high school students to watch- we had "Mr. Wizard" back then- you're the wizard now my friend!

@brainiac75 11 лет назад

Thanks :) It is neodymium magnets they use/used in MRI-scanners. They just use a lot of single magnets in them (up to 1 to 3 tons of them for each scanner according to Avalon Rare Metals!) stacked in a special configuration. Most likely some sort of halbach array - I don't really know.

@marcomosna6261 8 лет назад

Brian Bro... Your voice is calming :)

@brainiac75 8 лет назад

Thanks Marco :) I am a calm person, so my voice doesn't lie :D

@tomsmiek4953 3 года назад

Hell yes. THANK YOU. I was a bit curious about magnets but could not have wished for a more thorough introductionary video. You rock.

@brainiac75 11 лет назад

The magnetic field still penetrates the pyrolytic carbon even though it is highly diamagnetic. So you would have a quite normal magnet except for a fragile coating that would constantly try to escape the magnet :)

@brainiac75 11 лет назад

That's very generous of you!. I may have to arrange a trip to Aarhus ;)

@riotpoliec 11 лет назад

Wow, great video. Glad to see you are still making videos, I always enjoy watching them even if they don't have anything to do pertaining to my life!

@kat2873 10 лет назад

Wow very interesting, and you made it easily understandable for an idiot like me.. Your poor beer!.. Now off to watch more of your cool videos.. Keep them coming please.

@brainiac75 10 лет назад

Thanks for watching :) I will upload as often as possible - but this is only my hobby and my free time is limited. But I really enjoy making these videos so more will come.

@The_Joker_ 7 лет назад

Brainiac75 Have you ever successfully drilled a neodymium magnet? Bar under flowing coolant of course. Love your videos please keep em coming 👌

@brainiac75 11 лет назад

It's actually from magnetportal'de but both are selling the exact same magnet from the same surplus stock from a German generator company that changed the way they make generators (Siemens??).

@Waelsa2008 11 лет назад

Very nice and informative. I couldn't find all this information in one place and easily explained as you did. Thank you for taking the time to teach and inform others.

@brainiac75 11 лет назад

If I had access to supercooling I would experiment with superconductors :) Neodymium magnets improve their strength down to around -138*C but lower than that and they start loosing some power. Replacing the neodymium completely with praseodymium (Pr2Fe14B) makes some strong magnets that increase in strength the more you cool them - even at very, very low temperatures. I wish I had access to a lab...

@skyblair6608 4 года назад

Wow!!! Thank you, thank you, thank you!!!I have been looking for something to explain magnets, because I'd like to go magnet fishing as a hobby.

@Pph0n1x 3 года назад

i love these vidos, with the apocalypse at hand they are very comforting. thank you!

@1stFaris 11 лет назад

1-3 tons of neodymium magnets, no wonder they switched to using super conductive magnets. Thank you for the reply, I really appreciate it :)

@RoseMagpie 4 года назад

This was really informative and helpful! Thank you

@whispergb 8 лет назад

Great info with tongue in cheek humor. Thanks!

@brainiac75 8 лет назад

+Greg Barnett Thanks for watching :)

@zowsk4527 10 лет назад

Awesome videos! You should use meat or ballistic gel to demonstrate how dangerous metal objects and these types of magnets can be! Personally I don't know whether it would damage it but from what I've seen your largest one should make for an interesting video!

@tommygombar22 4 года назад

Valuable footage that enlightens the audience.

@machielste1 11 лет назад

Just wanted to say that your vids are REALY well made , and very nice to watch :D

@tosbossthinkorswimmplatfor3842 6 лет назад

Good vid .. simple ... a true Kraut comparison - magnetic strength to alcohol - LOL it was great ..and a good way to understand it simply .. thank you ...

@roycezaro1998 6 лет назад

How did you make the magnet attacking the beer look so much like a horror movie? It's almost like stop motion- super uncanny

@brainiac75 11 лет назад

That is actually quite tricky if you have a magnet of unknown grade. A gaussmeter is my only idea but those are expensive.

@1stFaris 11 лет назад

Great video as always. I was wondering how do Neodymium magnets compare to magnets used in MRI scanners. Not the superconductive magnets but the permanent-magnet used in older MRI scanners.

@brainiac75 11 лет назад

Thanks for the support! More videos to come so stay tuned ;)

@brainiac75 11 лет назад

Yes, I'm from Denmark :)

@snowthemegaabsol6819 8 лет назад

Two magnets with the same physical density will have a similar magnetic acceleration, though the field strength will diminish far quicker with distance on one that is smaller, and being the same distance relative to the ratio of the diameters of the two magnets will give you some complicated formula that basically tells you that it's weaker than one would think

@brainiac75 11 лет назад

Yes, but it would require an ever changing magnetic field to make something spin. And that requires energy. It is much easier to let wind or flowing water spin a turbine to get energy. In my personal opinion magnets are very well understood scientifically and follows the laws of conservation of energy. So no 'free' energy can be made from them. They are very good at converting kinetic energy to electricity though.

@brainiac75 11 лет назад

Nope, sorry. Max theoretical power for a neodymium magnet is N63-64. The highest lab tested neodymium magnet grade I have reliable sources for is N59 (according to a seminar at CERN in 2009 so it may be a little higher today). With that said neodymium magnets from HDD can be quite high grade, so you still have a nice magnet :)

@brainiac75 11 лет назад

There's an interesting project about 'transformational nanostructured permanent magnets' that expect up to 80 MGOe (the equivalent of a N80 neodymium magnet!). I really hope they succeed! As far as I know the strongest neodymium magnet ever created in the lab was around N59 - the theoretical limit for Nd2Fe14B is N63-64 but that will probably never be achieved (you cannot get 100% pure neodymium or iron for that matter as ingredients for the magnets). Thanks for watching!

@brainiac75 11 лет назад

Thanks for the support from all of you! I have the best subscribers :)

@brainiac75 11 лет назад

That's not a bad idea. I may make such a video. In my video 'How is a 6" neodymium magnet delivered?' you can see how my big magnet is stored in the original packaging. There are also some short clips in my video 'Testing my magnet collection'. Feel free to ask if there is something in particular you would like to know.

@DirtyAssa 11 лет назад

Great! I'm interesting find some magnet material for build audio coils & transformers! I'm also interested many kind of things! All the best! Assa!

@jasonmiller8839 7 лет назад

All of your videos are fantastic. I work in aerospace as an FAA/EASA inspector of jet engine components and I am about to go back to school for metallurgy and polymers, so these are a great learning tool. About your gold watch-band test; is it better to do that with a spherical magnet, and what if the size and RHmax of the one you were using?

@brainiac75 7 лет назад

Thanks :) Any shape of magnet will work for the test but I often use a spherical magnet because it focuses its magnetic force to a smaller spot on its pole. This gives it an intense field suitable for detecting the magnetic susceptibility of the material being tested. The shown magnet is a 1 inch N45 magnet. Bigger size and stronger grade will give a faster, more visible reaction.

@caaarl2707 7 месяцев назад

the ohh my beer got me. been watching you for years but now that i even know for sure youre german you got a sub😂

@javibel 11 лет назад

I really enjoy ALL your videos! They're amazing.

@brainiac75 11 лет назад

Thanks for watching! I have more magnet videos coming when I find time for making them so stay tuned :)

@brainiac75 11 лет назад

Because they are awesome!

@alizein5794 3 года назад

Good work. Thanks for this wonderful video which u entitled " Buyer's Guide " whilst u did not refer to where one can buy such magnets or price rates . Will u please do ?

@khebnaccountgemaakt 10 лет назад

Love how you compare magnets to alcohol!

@davidchanget2563 2 года назад

Thank you for this video. It helped tremendously

@Muonium1 11 лет назад

I don't think there are any videos on youtube exploring the reduction of magnet power at very low temperatures. That might be interesting to see with a magnet put in liquid nitrogen. I would like to see someone do a nuclear magnetic resonance measurement of the free induction decay of protons in earth's magnetic field and then compared to the higher frequency when immersed in the intense field of one of these magnets.

@alexgreene8931 10 лет назад

Great video man! Funny and informative.

@cvejic25 11 лет назад

Nicely done.

@mikeatona69 5 лет назад

I have a question about my 40x20 mm neodymium-magnet. I think that grade n35 is stronger than grade n45. How is this possible?

@brainiac75 11 лет назад

De bedste tilbud på større neo magneter er på den tyske eBay.de. Supermagnete.de har relativt gode tilbud og stort udvalg af mindre magneter. Forsendelsen er dog noget dyr, da de er nødt til at sende dem som pakker i papkasser. I almindelige kuverter ville magneterne sætte sig fast overalt hos postvæsenet :) Så det kan bedst betale sig at spare lidt sammen og købe en større sending hjem af gangen.

@MichaelsTechCenter 11 лет назад

Well look who finally uploaded a video.

@abdullah32592 11 лет назад

man , we love you too ^_^ keep up the good work , i mean you educate the humanity . thanks

@wa4aos 9 лет назад

Very helpful video. Many Thanks!!!!!

@Agap0r 10 лет назад

very cool explanation, thanks!

@ver64 11 лет назад

Awesome information,thanks

@jamessims1072 10 лет назад

I used to work for a company that did computer upgrades and refurbishment. I would take the old 5.25" floppy drives home and cannibalize them for the magnets inside. They made great fridge magnets, but I would never place them away from an edge area of the fridge(where they could be pried off). Could you tell me if they were most likely, historically ferrite or neos? I have no idea. They were incredibly strong for their relatively small thickness, so I would guess neodymium.... I wish I could still get my hands on some of these.

@brainiac75 10 лет назад

You can still cannibalize hard disk drives for neodymium magnets :) I have no experience with the old 5.25" floppy drives but neodymium magnets were invented in 1982 so they could easily be part of the drives made in the 1980's - especially if you found them very strong for their size. If they had a silvery, metallic coating they were not ferrite magnets. Thanks for sharing your story!

@dgamezonu2693 10 лет назад

Love your videos!

@thelamb288 8 лет назад

It would be great if you had a scale that had a maximum pressure guide. It would provide accurate PSI (or whatever) as to when the metal broke free of the magnet. You simply slide it back down to zero for the next test. Cheers

@brainiac75 8 лет назад

I may be able to find an electronic scale that stores/holds the maximum weight measured if I ever need this measurement again in a future video.

@thelamb288 8 лет назад

Brainiac75 Knowing you it will look and function perfectly :D Cheers

@BBadCraft 8 лет назад

2:54 you should start a magnet asmr series

@alexhsu190 11 лет назад

Can you please make a video on how you store your magnets?

@alexhsu190 11 лет назад

I was just wondering because my apartment is really small and the only place I can place the magnet box is in my kitchen, and there is like a bunch of metal knives and electronics there :)

@TheFlashinPulsar 11 лет назад

Would like to see you super cooling your magnets if you could. I might be too ignorant to know what I just said.

@tomjeffersonwasright2288 8 лет назад

Beer and Vodka. Something we can all relate to ! ! !

@claaaaams 11 лет назад

These are fantastic. Thanks for uploading.

@giannababb6626 7 лет назад

Thank you so much!!

@sachinmundra 10 лет назад

another well made vid! :) Cheers.

@RizLazey 7 лет назад

So basically ferrite magnets are x10 weaker then neodymium magnets, is that correct?

@brainiac75 7 лет назад

Yes, that is a good rule of thumb.

@chrisawesome3091 6 лет назад

How strong is a proton’s positive magnetic pull?

@yangyupeh382 11 лет назад

Your vids are awesome!

@uivideo7637 5 лет назад

Very useful thank you.

@spydercrypto8068 6 лет назад

Can you do some vids on using mags to deflect end & radiation?

@LazlaTheFallen Год назад

the prizes really gone down since this, could you do maybe new video aobut magnets of today and prizes

@Eastsae 11 лет назад

Informative and comical :)

@yvonneeibeck6581 Год назад

you should make your slide (@:52) as a downloadable slide -- very nice for teachers -- thanks

@roborobo8370 3 года назад

Now ik which magnets i want for my cube :)

@WayneJohnsonZastil 11 лет назад

Do think it's possible to create even stronger magnets in the future any ideas?

@SoulFoxie 4 года назад

1:15 *Me: "Yep that seems 100% safe right there"*

@caterscarrots3407 5 лет назад

Why did the neodymium magnet get attracted to the beer? Was there iron oxide in it or what?

@DavidChristmas 11 лет назад

Thanks for new video

@ishwar8119 9 лет назад

Um you could use a splitter tool instead of the guillotine.

@UEGUnequaled 11 лет назад

The computers in your house must feel like they're in a concentration camp.

@brainiac75 11 лет назад

Quality over quantity ;)

@HyperSpeed84 10 лет назад

Thank you.

@JLM32007 7 лет назад

thx. it helped me for what i need to know

@std808 8 лет назад

What size/grade/ type would you suggest for an excellent fridge magnet. Something that will hold 10 pieces of paper easily

@brainiac75 8 лет назад

+st D It actually depends a lot on the thickness of the sheet plate that your fridge is made of. On my modern Samsung fridge a 12x8 mm N45 disc magnet will easily hold 10 sheets of A4-paper.

@brainiac75 11 лет назад

They are a little stressed ;) I have a separate room for my computers that these magnets never enters just to be sure. Losing data is never fun...

@jesusjosegonzalezmeraz8645 10 лет назад

Thanks for the intel, sorry about the beer.

@undefinednull5749 Год назад

why working temp is so low compared to magnet Curie temperature ? A.k.a. the max temp before demagnetisstion begins?

@Therapor 11 лет назад

loooong time since your last video :(

@JLConawayII 10 лет назад

I want a magnetar-grade magnet. Where can I buy one of those?

@vagnersilva3083 8 лет назад

that our brow by the way broke both hix neodymium magnet end the ferrite.

@pakan357 8 лет назад

Ah, 0,33 L Carlsberg cans. I loved them during my visit to Denmark.

@brainiac75 8 лет назад

Yeah, they are one of the better things in Denmark ;)

@TucsonDude 10 лет назад

I'm thinking of buying two 50mm (diameter) X 25mm (thickness) magnets. Is there anyway to separate them if they are stuck together without a spacer? I've seen a guillotine method and the tool costs around $50.

@brainiac75 10 лет назад

Yes, you can separate that size with a large 'guillotine' even without spacer. In this video I do it with two 70x20mm: Spacer or No Spacer 50x25mm is quite a size so I would definitely recommend using a solid tool for separating them.

@Kalanchoe1 11 лет назад

always interesting :)

@bindujollyshibu9146 6 лет назад

What is the name of that strong magnet

@SleepBabySleep30 3 года назад

Do you have an email address? I have some questions as to the drop off distances when using permanent magnets and electro magnets. Cheers

@bartsomerson2099 11 лет назад

When I saw that magnet move I just thought, "Shit!"

@tripaseca4018 8 лет назад

oh.. my dear beer!

@jordanpick3731 9 лет назад

Hiya. Great Video thanks. I am creating a hexagonal spice jar rack that I intend on placing a magnet into the lid so it can attach to the fridge. Do you think a 10mx2mm N35 will be strong enough for this? Thanks in advance for your help

@brainiac75 9 лет назад

Attaching a spice jar rack to a fridge is not that easy with magnets. The magnets will easily be pulled down - the fridge has thin sheets and is quite 'slippery'. So no, I believe you need larger magnets or other tricks. Here's some info: www.kjmagnetics.com/blog.asp?p=leverage

@jordanpick3731 9 лет назад

Thank you for your help