"First I have to apply my couscous randomization function"

@stephenkamenar

4 жыл бұрын

but do you? wouldn't it sort itself out

@davutsauze8319

3 жыл бұрын

@@stephenkamenar It's just to prove that it has nothing to do with it being previously sorted out in a way or another. You don't actually need it to get the pattern, but you _do_ need it to test/show it

@janmamu8721

Жыл бұрын

the couscous is actually the seed in his function

@alunkard-geovane2685

Жыл бұрын

Cuz cuz

@janmamu8721

Жыл бұрын

couscous is actually a grain not a seed

I love the acouscoustics of that room..

The "couscous randomization function" is a staple of all modern physics demonstrations.

@SonOfFurzehatt

8 жыл бұрын

And the bane of Moroccan chefs everywhere.

@Ucceah

8 жыл бұрын

manual randomization is as indispensable to modern science as poking things with a stick

@SteveMould

8 жыл бұрын

+Cuda FX so true

@VonSchtauffe

5 жыл бұрын

Christmas came early

@DunnickFayuro

5 жыл бұрын

Who is Christmas?!?

What's even more crazy is that chladni figures were discovered by a guy with the last name Chladni. What are the odds of that?!

@gracecalis5421

7 жыл бұрын

Witchcraft

@Ianochez

6 жыл бұрын

ahahah soo funny

@ChrisBarrett1

5 жыл бұрын

keanu-reeves-whoa.gif

@aoe9015

5 жыл бұрын

Chladni figures were named after him -_-

@xogdo5260

5 жыл бұрын

@@aoe9015 woooosh

I've wanted to do this for years. I've only ever seen it done with an electric driver under the plate. Using a bowstring is beautifully simple. I guess I would have known if I had ever bothered to google the experiment.

@SteveMould

5 жыл бұрын

Hey Ben. Love your channel. Yeah, I did it with an electric driver at first. The benefit of that is you get to sweep through frequencies and see the harmonics pop out But I prefer the bow too!

I thought at the end Steve was going to say "A big thankyou to the Centre for Life in Newcastle for lending me their couscous." LOL.

@JohnnyYenn

8 жыл бұрын

He had to painstakingly collect all of the couscous and return it to them..

I would really like to see this in slow motion. How about collaboration with The Slow Mo Guys?

@smorbit2356

8 жыл бұрын

Not to offend him, but he still only has 20 k subs

@smorbit2356

8 жыл бұрын

But great vid

@Simon8162

8 жыл бұрын

+SM Orbit Yeah but he's a TV guy, you'll get a lot of viewers there

@Septimus_ii

7 жыл бұрын

I don't think it would look very interesting. I don't think the slow mo camera would should the vibrations any better, you'd just see the cous cous very slowly migrating to those parts of the plate

@joonasfi

7 жыл бұрын

A macro shot from the side view of the plate could possibly reveal the movement of the plate, which in slow motion should be very cool!

He would be a great science teacher

@Rock_Lee_The_Handsome_Devil

7 жыл бұрын

Kevin Le what do you mean would be, I class watching this as revision

Steve'S Wife: "OMG! What is this?? Its a mess in here!! Why is there Couscous all over the floor?" Steve: "I just randomly distributed them"

Brilliant. Never seen this done so beautifully. Very clear explanations. Nice level of equations put in, and scope for the viewer to think about the more complex patterns and where he is bowing and also where he is holding the plate edge with his other hand.

that was cous cool!

@rbokhoree

7 жыл бұрын

Get out.

@magiv4205

7 жыл бұрын

stop.

@brianmchaney7473

7 жыл бұрын

Coach McGuirk Nah, man. It's all cous cursed!

I'd love to see this with different shapes - hexagon, pentagon, triangle, circle, and maybe an irregular shape. Actually, what happens when the plate is fastened somewhere other than the middle?

@dankwarmouse6248

7 жыл бұрын

Fastening the plate somewhere other than the middle is a brilliant idea, I imagine it'd generate some more of the asymmetrical patterns that occasionally crop up.

@KaosFireMaker

7 жыл бұрын

I think that is partially what he was doing when he places his finger at different spots

@AlanDong

6 жыл бұрын

KaosFireMaker I think the finger placement (on a node) and the bow placement (on an antinode) is to influence the dominant mode of vibration

@Ianochez

6 жыл бұрын

I may think that is the shape of the plate determine greatly the shape of the possible figure. since the speed of the wave traveling in the plate is determined by the material, in refering with the speed of sound. by consequence, the plate have a resonance to only some of the frequencies that travel and rebound within the surface. So when you don't get the right frequency, you generate the asymetrical figure that bounce semi-randomly, so you already got your asymmetrical figure you asked for and that can be considered as the random couscous function too. (in my opinion) the physics behind the effet is "locked" with the resonant frequency of the plate and that is determined by dimensions, material, structure. you can think of a symbal in a drum set, communication antennas or even string of an music instrument. I surely can be wrong, but seeing in an other point of view is good. So, it could be very interesting to have a plate with different shape but the attach point must be in a resonant point. and the very center is a good place to start, but we don't know if we don't try it.

@phdimposter

5 жыл бұрын

This phenomenon has been studied extensively. Mary D. Waller, for example, wrote several academic papers on this with circular plates that have nice pictures.

Wow, I love both couscous and acoustics. Great vid! Cheers sir.

I am a science enthusiast from Morocco and I LOVE it (for more than one reason ;) ) Elegant maths, beautifully explained. I subscribed and will tell my friends to subscribe :)

@ouissalwrb9309

7 жыл бұрын

i'm here because of you , thank you ! ☺

@hadirkawtar1045

7 жыл бұрын

I subscribed because you...thnx M.Najib

@charaf.

7 жыл бұрын

Here because of Najib , thank you , now let's science the sh*t out of it **

@amineaboutalib

7 жыл бұрын

Najib EL MOKHTARI eyyy Najiib

@frechjo

7 жыл бұрын

I'm here because of Matt Parker, but hi!

Grrrreat explaination!!! I’ve watched videos about this for years and NEVER heard it explained in a way I understood!!! AWSOME!

The shapes, the music, and the physics were mesmerizingly beautiful.

Wave physics is a subject that propagates through all of science...... Punny XD

Do you want ants? Because this is how you get ants.

@brama100

8 жыл бұрын

+pronobozo LOL! :O)

@SteveMould

8 жыл бұрын

+pronobozo nooooo!

@FAhmad1782

8 жыл бұрын

lol maybe the trick will work with ants

@hineighbor

8 жыл бұрын

Our relationship with ants is weird. Ants are, like, "Hey, I only want these crumbs, ok?" and we're all, "No you motherfucking will not."

@supernaturalswampaids8083

8 жыл бұрын

+Hi, Neighbor! Exactly! Once the crumbs are all ate up, they leave.

Notice how the couscous never settles at the location where Steve drives the plate with the bow. Also for the later patterns in the video, the lines of couscous always touch Steve's finger. Very neat demonstration!

Best video I have seen in a while! Great clarity on a really neat subject.

Wonderful demonstration and explanation- kudos. My brother and I made and played Chladni plates nearly fifty years ago, and were able to get 22 different patterns. But your plate is much clearer, being bigger, and couscous does indeed work better than the salt or sugar we used. Thanks. Cheers from cold Vienna, Scott

@SteveMould

7 жыл бұрын

+Scott Wallace thanks Scott.

Thank you for bringing this into my attention. I had never heard of Sophie Germain before and when one thinks of how common these patterns are in vibration analysis today, that is quite shocking and a great shame. For example, nearly everyone knows about Lissajou's figures by comparison.

Working as a pianotechnician this phenomenon of the chladni plate is very insightfull. Only this video made an addition on that knowledge as you use your finger to help the nodes/flageolet to be. Great stuff!

Fascinating video and the concept was very well explained. The visualisation of the formula was very helpful. I look forward to more videos in the future.

Super interesting- the patterns come out looking like Buddhist and Hindu mandala patterns, which are basically derived from "observed" cosmic vibrations through meditation and mantras of verse hymns- so that makes sense and makes me think those old chanters were on to something important!

Wait I see two things you're changing here. You're holding one particular point with your hand (forcing that point to be a node) and bowing at a particular other point (forcing that point to be an anti-node). As you move those two points smoothly, how does the pattern change? Does it deform into the next one?

@SteveMould

6 жыл бұрын

Well spotted. The pinch point is where the node line meets the edge. And where I bow is where an anti node meets the edge. If I transitioned smoothly I simply can't make a pattern anywhere between the two.

@AlexKnauth

6 жыл бұрын

Okay. I guess it's sort of like the non-resonant frequencies of the Rubens tube. I would expect more of the combinations to be resonant on a square than in a tube, but not so many that it would be smooth in between.

@thewolfin

6 жыл бұрын

These guys made a music video with various cymatics effects, they go into more detail about plate size, shape, and resonance nigelstanford.com/Cymatics/Chladni_Plate

@coolninjabroguy

5 жыл бұрын

So basically the offset In the resonance from two frequencies changes how it looks

@morganahoff2242

4 жыл бұрын

@@SteveMould This looks similar to the way one gets harmonics on a guitar string: by stopping the string to create a node. It works best for the first few harmonics, dividing the string in 2, 3, and 4. Harmonics beyond that are possible, but faint and hard to achieve. And if you stop the string not quite on the 1/2, 1/3, and 1/4 point...it barely works.

I can't Believe it, some of these shapes remind me of the shapes I see while making music. Often they help out when trying to remember advanced, complex parts. I have a an issue called synesthesia and Ive had it since I started playing music. I'm blown away by this video, thank you!

Proving that frequencies, thou misunderstood and unexplored, hold everything together

"uncooked" hahahahaha

@KingsDaughter.

7 жыл бұрын

I know right, I was laughing at same thing but no one here gets it :-D

@epic9711

6 жыл бұрын

I don’t get it...

@gnarthdarkanen7464

4 жыл бұрын

BUT he didn't specify Israeli or Pearl type.:o(

WITCHCRAFT

@canterinalong

8 жыл бұрын

spaceye But he's just a duck...

@stormyweather1392

8 жыл бұрын

+Patsha Ha ROAST THE DUCK!!!!!

@jodinha4225

7 жыл бұрын

Stormy Weather roast the mold!

@katnip6289

6 жыл бұрын

shut up you dumbass!

@nurdgurl7033

6 жыл бұрын

spaceye 😂

a vivacious presenter. a good case study on how to make an esoteric presentation come alive through rich and striking emoting.

amazing. you're right, I have never seen this experiment don't like this before. so mind blowing. love seeing it re-created like this.

I beleive you just described a peice of the universe.

@marblegray

7 жыл бұрын

Yes, that's one way of thinking of it. "The sky is blue." There I did too! (And I rhymed while I was at it.)

@KennyCiseroJunior

7 жыл бұрын

+MarbleGray you're a poet, and you didn't even know that you were one"

@marblegray

7 жыл бұрын

Bwahahahaha!!! That's amazing you genuinely made me snicker.. XD

couldnt you use a beaker to pour out the cous cous instead?

@SteveMould

7 жыл бұрын

+BoomerBoxerReal I admit that would be a better video.

@martanoble2320

7 жыл бұрын

Prassel eyes open! isn't that what the universe is working? .

He is making harmonic intervals with his fingers to produce the different shapes at the end. That is so beautiful cool and amazing.

I used to see some gorgeous six-sided patterns appear in the swarf when drilling large metal obects with a >10mm drill. Now I know why, thanks Steve!

First, I need to apply my Cous Cous randomization function *proceeds to scatter it with his hands* xd That was hilarious

Beautiful! If you were to use boundary conditions and differential equations to derive those analytically, I would have died happy lol But really, the simplicity of your experiments and how they help build intuition is invaluable.

@SteveMould

7 жыл бұрын

+Silas Ifeanyi thank you! Yeah, i think i could have done that once but it's been a long time since i had to solve equations like that!

Loving your videos, keep them coming !

I wish I had seen this while learning wave guides in my EM class. Thank you so much for this demonstration!

"It's a scatter plot--" The inner-Bo Burnham fan in me: Better call Michael J. Fox to trace it.

Hi Steve, this is awesome!! If I wanted to do this, what type of metal would I use? Does it have to be a certain thickness?

This is the first science video I’ve seen in a very long time that made me exclaim out loud! Thanks for bringing us stuff that Veritassium, v-Sauce, smarter every day etc don’t do.

I was searching for couscous recipes and ended up here, I don't know what's going on here but I love it!

"Couscous randomization function", hahahaha nce! Well done sir.

@Ianochez

6 жыл бұрын

Joonas Loppi 3:14 ahah

@Fifury161

5 жыл бұрын

Or should that be, hahahaha rice!

you got yourself a new sub ;D

@SteveMould

8 жыл бұрын

+OverlordXVII yay!

@OverlordVII2

8 жыл бұрын

+Steve Mould i wish channels like yours would be a little bit more popular ... that's exactly what youtube's for in my opinion :D .. not making some shitty reaction videos to other shitty videos :D ... keep doing what you're doing ... much appreciated ;D

@MultiSciGeek

8 жыл бұрын

+OverlordXVII yup same here

Beautiful and so well done! Bravo!

Dude, you are among the finest youtubers. Huge respect.

awesome

Could you possibly post a few links that offer a more detailed explanation of the mathematics

@andreguimaraes9347

7 жыл бұрын

derek xiao just waiting for the same thing here

@kevinjose293

7 жыл бұрын

derek xiao en.m.wikipedia.org/wiki/Vibration_of_plates

One of my favourite videos ever, thanks!

Nice job. The boundary conditions stayed the same, but you were able to excite different harmonics. Standing waves are great fun.

1:51 This was designed with couscous in mind. It even has cos in the equation. Yes I know it means cosign. I'm not a complete idiot.

Perfect science and emotion. Thanks many times! seems the 2 variables are the placement of the bow and the hand.. correct, or is there more?

@SteveMould

8 жыл бұрын

+john-felice Ceprano that's correct!

@rajarshibose3842

8 жыл бұрын

+Steve Mould Maybe the Mandala made by the buddhists try to imitate this natural occurring phenomenon..... Don't you think??

@Haileyn

8 жыл бұрын

+Rajarshi Bose I was thinking just this!

@Ianochez

6 жыл бұрын

I may add the structure, the material, and the shape of the plate are other variable. If not, there is no resonance, the note your hearing, so there is no shape. So one table should have only a limited number of shapes. I may think that the distance of the finger and the bow is a quarter of a wave length traveling nearly at the speed of sound, and that determine the distance between lines. there is something else too called harmonics, wave within other waves that I cannot explain how they could work in that plate.

Seen this type of demonstration a few times now, both on video and in person. Never really gets old, one thing I must admit though... I'm rarely a fan of the sounds that are being produced when creating the patterns. But they are part of the experience and explanation, doesn't make them less unpleasant sadly.

Just stumbled upon your channel. So good dude! Thank you!

Are they doing crop circles this way ?

@spootot

7 жыл бұрын

:0

@xkittykattrinx

7 жыл бұрын

Perseane I'm shook

@KennyCiseroJunior

7 жыл бұрын

This blew my mind

@savannahlevy97

5 жыл бұрын

they'd have to vibrate the corn field with a super loud sound wave, and the corn field would have to be like a flat sheet of metal.

@paddyt4043

4 жыл бұрын

@@savannahlevy97 who's they

Do you need a special type of plate/metal for this? Or can you use any metal plate?

@Ianochez

6 жыл бұрын

Siân CD any metal plate should do, it needs to be uniformly made, light, super flat, robust enough to not wobble down from the center to the edge. need to be attach at a the very center with the tiniest bolt you have. if you can, try other perfect shape like triangle, hexagon and so on, you'll make a viral...

always appreciate your content.

Wonderful demonstration sure to get you a lot of followers.

What is the coding for the couscous randomization function?

@SteveMould

8 жыл бұрын

+Aiden .C it's, uh, complicated.

"...for lending me their Chladni Plate" Will this work on a normal table?

@Oniontears123TNG

8 жыл бұрын

Only if it has normal modes of oscillation you can induce.

@Ianochez

6 жыл бұрын

don't think so, he wouldn't have to borrow a table for the experiment.

@gnarthdarkanen7464

4 жыл бұрын

Sort of... PROVIDED your "normal table" had a rather specific "harmonic value"... Meaning, the Chladni Plate here was specifically tuned to achieve certain tonal values, and thereby specific wave-forms. There are structures under the plate (besides the obvious support system to allow free vibration) so he can adjust from one tone to the next. While nearly everything structured does have some form of harmonic value, not all are even audible and the acoustics of the material (like wood for example) don't necessarily work so well for maintaining a single waveform long enough to "dance the couscous" into shapes well... Almost any reasonably hard steel plate CAN (however) become shaped and tuned to at least achieve one such Chladni waveform as demonstrated. It's up to research, engineering (hard math) and a bit of precision in craftsmanship to set up a system to get more. You could get lucky, but I wouldn't hold my breath when I went shopping for steel plates and tables. ;o)

The fascinating thing is that the pattern illustrates the harmonics you hear. The shorter the distance between the lines, the shorter the wavelength. The shorter the wavelength, the higher the frequency generated within that wavelength. The pattern at 3:30 is very dense and symmetrical, mostly due to that super loud and high harmonic that sounds like your ears are ringing

Thank you, Steve, great vid!

If you played the same note, but an octave up, would the pattern be similar but perhaps smaller angles or curves?

@SteveMould

7 жыл бұрын

That's basically right, yes. With higher notes you get more complex versions of the patterns. It's not quite right to say "an octave up" becasue going up an octave means doubling the frequency. On a vibrating string, doubling the frequency would be sure to get you to another harmonic, but on a square it's more complicated and the next harmonic up might not be at double the frequency.

@Ianochez

6 жыл бұрын

an octave up is half the wavelentgh, and the distance of the finger and bow is a quarter of the wavelentgh that travel nearly at the speed of sound determined by the material, dimensions.

You, with the black magic... stop it

I have known of this phenomenon for years and finally I understand 👍. Thanks great teaching.

That last one is absolutely beautiful!

I hope he still ate that couscous

@jasondashney

6 жыл бұрын

Then he played a violin and this is what happened in his upper digestive tract.

Same thing happens when you pour salt on an amp. Every frequency created a unique pattern.

O:36 SUCH a grin! The man does love his work!

Astounding! Thanks for this video!

how is that patterns are called again?? sorry, english is not my first language.:S

@SteveMould

8 жыл бұрын

+MrNTC96 Chladni

@Queer_Nerd_For_Human_Justice

6 жыл бұрын

Chladni!

Feels like I'm watching "Fun with flags with Dr. Sheldon Cooper"

Absolutely incredible

those are amazing shapes.. especially the last one..

I can't hear a word he's saying. He's so handsome! 😍

For the love of Jeebus! Humans need at least a little bit of sleep!

Physics and dynamics are amazing subjects and the phenomenon they can describe is so vast

My mind was absolutely blown watching this

Beautiful!

Never seen it actually explained why the heck the stuff moves around like it does! That’s so simple and makes total sense!

Rather neat that you can see the effect of choosing boundary conditions by holding different places on the edge. (for those who don't get this, observe that there is always a line that starts from where his finger is)

I remember seeing this video many many years ago, steve mould just got recommended again to me n i thought he seemed familiar and this vid is why

Fascinating stuff!!

How did i just miss this chanel ?? im defintly subscribing !!

The sound of your experiment gave me some good ASMR I'm not kidding

Great Educational video on 2-dimensional standing waves

I never knew the lines marked the unmoving parts of the plate it all makes so much more sense now

Awesome video, thanks!

Brilliant - thanks for posting, my class loved it!

@SteveMould

8 жыл бұрын

+Paul Tyler yay!

This is what KZread needs. Thank you.

Thats some dope stuff right there

Quite impressive. Thank you!

The one that produces the octa circle he's bowing at a 3:2 ratio which is a perfect 5th. The square plate represents Space while the Rosin Bow represents Time and the sand represents the stars and planets.

I'd be playing w/ this all day..... That's so cool.

I really love the sound of bowed metal. It's beautiful.

Amazing!! Thanks for sharing!

With placing you finger and the bow on specific areas of the plate, it seems to work exactly the same as musical harmonics on stringed instruments.

The last pattern was the ultimate.