A better description of resonance

[@emlun]

A very intuitive example is a children's swing set. If you've ever been a child you'll know you can give yourself a tiny amount of speed by leaning forward or backward on the swing, and you can gain more speed by alternating with precise timing. If your timing is off (not resonant) you'll lose speed instead, but by making your small disturbances at the swing's resonant frequency you keep accumulating more and more energy.

[@edwardwheeler197]

Emil Lundberg - if you’ve ever been a child??? Am I missing something?

[@leavewe]

that's not what i remember, the speedup has nothing to do with resonance, it's just about putting your center of mass further in front as you come down and back when you come back

[@agentjeb4103]

@@leavewe I think hes trying to say its more effective at that particular point, if you put your center of mass in the correct direction. There is a wave-like behavior in the period of the swing, so the analogy works, but its more of a math reason than a physics reason.

[@WormholeJim]

Eventually you'll go all the way around and get catapulted into the ground. Oh, the fun we had!

[@h4724-q6j]

@@leavewe "As you come down" and "when you come back" are the key parts. You have to do it at the right time or it will cancel out and remove energy from the system, and that's the resonance.

[@ytmsz98]

Thank you for repaired speakers. When you blown into a bottle, my speakers oscillated so strong, that something happened with connectors and I have stereo again, really.

[@p.as.in.pterodactyl1024]

That's awesome. Save this video for later in case they go mono again lol.

[@ittaiklein8541]

@@p.as.in.pterodactyl1024 - maybe even go around the house with it and fix various malfunctioning instruments...

[@mamas_quilts3573]

@@p.as.in.pterodactyl1024 😂😂😂

[@mamas_quilts3573]

@@ittaiklein8541 😂😂😂

[@bluemamba5317]

Just be carefull so you don't change the resonance off the earth.

[@nickrichards3354]

Someone should make a book of 'Steve Mould Quotes'. E.g. -"I can smell percentages" -"It is a guitar, i'm just massive"

[@VenetinOfficial]

@SmoothRide needlessly hostile

[@isaacmiles-watt2758]

“First, I need to apply my couscous randomisation function” “I’m skipping dinner and moving straight to electrocution”

[@VenetinOfficial]

@SmoothRide Or, you know, it was just a bit of a joke..? Again, needlessly hostile. It seems quite a few people here get the innocent fun, if that upvote count means anything. You're confusing good fun with idiocy.

[@SheWhoPlays2]

Nick Richards its a #ukelale

[@SheWhoPlays2]

I like this a whole bunch. Subscribed. Sharing with 10yy grandson picking up the guitar and learning. He is a natural engineer. Was building roadways rpund his home by 5. I wayched some calculus videos with him. He got it! 😯

[@Helloyousilverdevil]

Every time I watch you I’m astounded by how slowly you speak but how much clear, useful info you’re giving in every sentence. Apart from the awesome info you give, I’m paying almost more attention to how good you are and conveying the knowledge so I can get better myself.

[@fg9844]

Awesome

[@GABRIELFILMSTUDIOS]

Small thing: The perceived frequency is actually the loudest resonant frequency - this just so happens to almost always be the lowest one, but it isn't always. In a clarinet (I think?) it is possible to create sounds where the loudest resonant frequency is not the lowest.

[@SteveMould]

+GABRIELFILMSTUDIOS good info. Have you heard of the missing fundamental illusion? It's related and is really cool!

[@EsIsJaNichtsMehrFrei]

Steve Mould Good point. I'm not an expert, but i had a lecture about psychoacousics and i wrote my Bachelors Thesis in this field. Because the higher harmonics are always at frequency multiples of the base-frequency, you can even fill in missing ones. The perceived pitch for tones especially complex ones is very difficult. But the most basic thing to know is, you perceive it at the base frequency, even if its missing; not at the loudest. Try searching for "virtual pitch" its very interesting. And if you are really curious: psychoacoustics by Hugo Fastl and Eberhard Zwicker is a great book, in which i actually just looked ;-P

[@mattlm64]

How do you define base frequency? If it isn't the loudest then what is it? What I've found is that applying frequency or amplitude modulation to a wave changes the perception of pitch. Ratios above 1 increase the perception of pitch, and ratios below 1 decrease it. At least this is true for the ratios I've tested. Also adding harmonics to a sine wave to create a square wave, sawtooth wave etc. increases the pitch which makes sense as it involves adding higher frequencies.

[@EsIsJaNichtsMehrFrei]

Matthew Mitchell Sorry my english isn't that great, so I'm kinda struggeling to explain. The multiples for harmonic tones are only derived of positive integers. Everyone of them has a factor, which accounts for the timbre or "how" it sounds. (Imagine how different instruments or vowels on the same tone still sound different.) I think its easiest understood with an example. Take 1kHz as your base frequency. The harmonics are then at 2, 3, 4, 5, 6, kHz and so on. If you would only see 3, 4, 5 and 6 kHz you could still figure out, that the base would have been 1 kHz, cause there's no other base frequency which would fit. Your hearing kind of checks what base-frequency would fit and is the highest. If there were only 2, 4, 6, kHz and so on you would perceive its base frequency at 2 kHz, even though 1 kHz, 500 Hz, or 400 Hz would theoretically fit. The less harmonics there are the more ambiguity there is, of course. Does that make sense?

[@mattlm64]

Sure, that makes sense, though personally I have listened to the "missing fundamental illusion" and to me the version without the fundamental sounds different. It sounds tinnier and you can notice the absence of the fundamental. The overall perception of pitch is higher. Also, as I mentioned, the addition of harmonics and sidebands to a frequency changes the perception of pitch. I've noticed this when experimenting with additive synthesis, frequency modulation and amplitude modulation. Surely you would agree that a sawtooth wave or a square wave sounds higher in pitch than a sine wave of the same frequency?

[@randyjackson140]

When I was much younger I used to do a lot of cave exploring. One thing I always enjoyed doing was finding the resonant frequency of the cave passage I was in. It was usually a low wet long crawlway or canyon. It was normally a fairly low frequency, like when you clear your throat. When I would find it, it would greatly amplify and rumble down the passageway. Lots of fun, but sometimes it unnerved the people I was with.

[@ghostmateify]

they were unnerved cuz ur an @pe, soldiers constantly crash bridges walking over them you can implode a cave, or for that matter, any object including a BUILDING just by hitting resonance

[@alexandermcclure6185]

Sometimes my voice cracks perfectly into the bathtub's resonant frequency when I'm talking to myself.

[@circeltea]

i always really hated my math and science classes in high school--it never felt like i understood what was going on, which made me very anxious, which only made learning more difficult. not only does this channel make science concepts intuitive and easy to learn, but i also find myself arrested by the loveliness of the language of science. somehow steve's very plainspoken explanations feel beautifully and comfortingly poetic. im in grad school now for something non-STEM but watching these videos makes me forget my science-related fear and feel like an excited kid again in the best way. i feel intellectually nurtured and inspired :) thank you, steve!!!!!

[@carolcossa6244]

I am 70 and have been playing music since I was 3. Now, I play touch/velocity-sensitive wavestation keyboards...and I found this presentation utterly fascinating.

[@markdillon6373]

That tube is wonderful. I’ve never heard of it and it is the coolest visualization for standing waves I could ever imagine. Thank you sir.

[@lucapontiggia3123]

I always liked the statement my physics prof told me in my honours year. Resonance is the frequency at which maximal energy transfer occurs from the extremal driving force into the system.

[@gizmoguyar]

Is that really true? If the impedance of the extremal driving force is extremely non linear, it's possible for a system to resonate at a frequency where the energy is lower than another non-resonant frequency. I was always taught that the resonant frequency is the frequency where the ratio of stored energy to dissipated energy is the highest. On both sides of resonance, the energy dissipation rate increases faster than the stored energy increases

[@catburner1896]

Your comment has serious just helped me so much just now. I’m having to write up a lab report on resonance and have found myself really confused on why resonance makes music better. This explanation was incredibly helpful.

[@srikanthtupurani6316]

I have not seen a better explanation of resonance than this. This is amazing. This kind of experimental equipment is found in very few labs.

[@droomahbroo9291]

Seriously great explanations and super well presented! I saw one of your TED talks where you said you were more like the poor uncle of a teacher.. I see you more as the guy we come to when the teachers and resources provided to us lack the passion and ability to describe in a way we can understand... the guy behind the screen, building the passion that teachers take credit for. The guy that blows white noise into a students head and causes the passion for science and the world around them, to become the antinode of their lives. You rock Mr Mould!

[@murpaderp8461]

This needs to be a larger series and more people should be watching it.

[@KwanratSuanpong]

Thanks!

[@Starsnipe]

I remember my High School chemistry teacher did the Rubens Tube! It's so cool :D

[@electroprem]

Lol my high school never ever would know what's this thing fuck

[@ianbuilds7712]

Chemistry?? This seems like a far more relevant physics lesson 😂... That being said I bet different flammable gasses will have different resonant frequencies..at different temps but only because the speed of sound in butane is probably different than propane or methane or acetylene...etc.. Which is a physical property idk smokem if u gottem I guess lol

[@NapoleChan]

I remember my fellow High School chemistry student did the Rubik's cube! It's so cool :D

[@RWBHere]

You could say that it's a hot topic.

[@TheAngiepangie424]

@@RWBHere Hot topic was one of the cooler stores in the mall when I was a kid 😎

[@prynk7]

Thank you Steve. The best video I have ever seen on KZbin. Your way of explanation is not only far superior but also highly logical which helps the propagation of knowledge through many man-made barriers.

[@leftysheppey]

"Yes, this is a guitar, I'm just massive". I love you Steve

[@samnub7912]

Our physics teacher showed us this in class last year! It was a beautiful sight with all the classroom lights switched off

[@seachangeau]

love your calm style :) so refreshing after american shouty science demos thx!

[@crackpapa_]

Your description of understanding entropy was absolutely amazing. Now I know much more about entropy than before and that is thanks to you! I wish I had a teacher like you in the schools I went.

[@Chalisque]

Resonance is like pushing a swing. If you push in time with the swinging of the swing, the amplitude will increase.

[@patrickhodson8715]

"It is a guitar, actually. I'm just massive."

[@25maxman]

Patrick Hodson "I can smell percentages"

[@Jefferson-ly5qe]

Steve is fucking swole af

[@tvoommen4688]

It is an ukelele, not guitar.

[@gerryjamesedwards1227]

Piccolo bass.

[@dieenttauschung4124]

@@tvoommen4688 What do you mean? That's clearly a guitar

[@nitnvg]

I am amazed by the clarity of thought and explanation. We need more teachers like these

[@andythomason5576]

Dude , this was the coolest demonstration I have ever seen. I have watched a few of your vids before. This is the one that made me subscribe. You know what your doing and I like someone I can learn something from that I didn't already know. Thank you for sharing your knowledge in such a cool and easily understood way

[@SteveMould]

+Jhon starcher thank you!

[@sadmemeboi]

6:39 i think it's the other way around, for example at 6:20 you can pretty clearly see both ends would have peaks, and with standing resonant waves, you have nodes at the ends. It also makes sense because the air is going out *and back in again* very fast on the antinodes, which means it would be hard for the flame to stay consistently strong outwards, while on the nodes, you have very little variance, *meaning you only have the steady flow of gas out from the chamber since you're steadily adding it from the tank*

[@tompurcell1499]

Has anyone solved the Ruben's Tube? Look, someone had to say it!........I'll get my coat.

[@chrisakaschulbus4903]

@Mike Rogers don't give him that hat, i saw the butler doing questionable things with it

[@Buzzhumma]

do you means Rubik's Cube?

[@Buzzhumma]

American Hostage 😂😂

[@ittaiklein8541]

@@Buzzhumma - either you don't get the joke, or you're dissecting the joke, neither reflect positivity on thee.

[@akshaykorlekar]

Super explanation! Loved it. I came here to learn Resonance and I am taking back so much more. The Reubens tube ! That's amazing piece of equipment. So simple yet so expressive.

[@asiburger]

I case you wonder, the song is "Final Cut" by Jeremy Grutton.

[@SamSamSamSameSamSamSam]

Out of curiosity - Is there a version without words?

[@lambdaexclamationpoint]

Gratton*

[@MarioAlemNeto]

Thank you! I was wondering, indeed!

[@alistairferguson6590]

At rest Kevin mccloud

[@Y.M...]

Thank you

[@theworldofdebesh4742]

I am seriously stunned after seeing this video, gave a totally new and better perspective to look at resonance. The Rubens tube example is straight up genius.. Hats off man

[@Peter_1986]

It's pretty amazing how Fourier Series allow you to create any wave form just by adding sine and cosine functions together.

[@empyrean-jamelgreaves8034]

Yes, that is heavily implied at the end, bit odd to draw from the entire video...

[@chetnalawless197]

If you were my teacher at school, I would have gone into science. You make this clear. So inspiring... thank you.

[@AlexandreMachado0]

10:57 The most beautiful VU meter I've ever seen.

[@northjoe]

Could have stopped the video at 2:22(glad you didn’t). That was the best explanation I think I’ve ever heard. I totally had one of those a-ha moments. Thanks

[@matgrat7485]

Me too but at least it makes a li bitl more sense

[@comradegarrett1202]

I remember being a small child and playing in the bath tub and discovering that if I moved my feet repetitively at just the right speed, I could make waves in the tub get bigger and bigger and bigger just like this. I thought it was the coolest thing ever, but all the water splashing out damaged the floor and my parents were not impressed

[@siegfriedlechler7412]

Resonance is always associated with increasing power. When the wind causes a tree to resonate, it falls over. If the tiny energy from a radio antenna is fed with resonance, it can be processed further. Every thing has its own frequency with which it resonates. The size of the oscillation amplitude depends on the internal consumption, which is the damping. The human body can also be set into vibrations. Its natural frequency is around 2Hz. This is very helpful in relieving muscle tension.🤠

[@DunnickFayuro]

That thing is lit!Forget the fireplace, that's what I want in my house. Every music you play gives you a different show.

[@innersoundsacademy]

This is so fascinating! Quartz crystal bowls create standing waves with essentially zero harmonics, it really is a straight tone just like your sound tone and that is part of what makes them unique as an instrument. Such a great way to explain what feels like a complex topic. Much easier to understand than other videos in my research.

[@wickandtallow6222]

My favorite Rubens tube is a long, cylindrical-shaped piece of rye bread filled with corned beef, swiss cheese and sauerkraut!

[@MrAmalthejus]

The world needs more people like you. If every school had a guy like you we would inspire the next Einstein and Stephen Hawkings... Humans would be 1000 years more advanced by now. Thank you for clearing this long standing doubt that I had for years

[@ii795]

Wow, the ending part of this video is awesome. I just thought, wouldn't it be even more awesome to have several Ruben's tubes of different lengths put togheter, so that at least one of them resonates to each note in the piece.

[@theDevintage]

"It is a guitar, I'm just massive" I knew it! I knew it all along!

[@Jasperr2016]

i think making music is the best way to understand, it just makes sense on accident naturally after a while. that being said this is the coolest visualizer i’ve ever seen i want one

[@247flashgames]

How would the experiment differ with different waveforms: square, sawtooth, pulse, and so on?

[@superdau]

Not much. You will mostly see the lowest resonant frequency in the signal. All the other frequencies, including the higher resonants, typically have much lower amplitude. (just check out any fourier spectrum of a signal and you know what to expect)

[@superdau]

Like I said in the preivous comment... It will look the almost same (if there is any difference at all).

[@DRXxUziixX95]

with any luck the flames should form the shapes.

[@wiadroman]

Waves of different shapes are compositions of sine waves (Fourier series) so you will see a composition of standing waves. However, since lower freqs in Fourier series usually dominate, the result will be similar to pure sine wave of the base freq. Also, there is the "blurring" effect of the medium (each medium works as a low pass filter).

[@Voluntarists]

Square waves ARE made up of an infinite numer of sine waves. They do not exist except as a group.

[@rajindaranasinghe8521]

Thanks for your effort to explain what resonance is in a simple way .

[@dominicsurette2890]

I can smell percentages

[@calembur]

So I literally had to stop watching the video as my wife started to complain about the “annoying sound” of the resonating tube. I’ll be back.

[@mikelgabiolaleniz]

I noticed at minute 7:20 that when you're going down with frequency, you're actually getting response in E , D, C, Bb, Ab, and so on (that's a difference of an exact tone or two semitones between eache response and it seems like they are perfectly tuned as well). That means that there must be some kind of relationship between this effect and the actual system we're using to do music. What I mean is, are the musical scale (and the way it's organized) and the musical system itself casual? Just a coincidence? Or is there any real physical relationship between how have we chosen to use or organize music and how it really works? I just wonder, I'm not an expert in this area so I can't perfectly be wrong. Great video, thank you!!!

[@derp9057]

What the heck? How did you make out all that information from here?

[@omegalamda3145]

Pythagoras

[@_motho_]

There was this paper i read that posited that musical notes are some sort of universal constant. I haven’t read it in years and I doubt I could find it, but it was talking about how coincidental it is that frequencies that sound nice line up really well into our musical systems or some shit like that.

[@ben1147]

They are the natural harmonics of the fundamental but scaled up by octaves. Not totally sure doe

[@ericscaillet2232]

@@ben1147 the length of the tube and it's reflective and tonal quality should have been specified.

[@evolutionarydays5237]

Absolutely amazing video. The Ruben's tube really helps visualize the processes going on within the pipe as different harmonics and overtones of the standing waves are reached. Marvelous demonstrational video, thank you so much.

[@pandaland1]

The music you could make with that would be so lit

[@PromptedHawk]

Get out. Actually, come back in, that was a good one, even if you used "lit".

[@dartme18]

Excellent demonstration! At 8:52, you say that the white noise from your mouth gets amplified by the bottle producing a perceived tone. I'm pretty sure that's incorrect. Without resorting to an explanation, I can provide a counterexample: if you provide an air source that does not have any sound, you will still get the note from the bottle (like in an organ). Keep up the good work!

[@paulsmyers203]

8:20 ... so what you're saying is, when a Caucasian nerd speaks ... it's white noise? ;) Fun video. I'm inspired to build a fireplace using a Rubens Tube and attaching a speaker playing classical music. Science, art, maths, relaxation ... a near perfect scenario.

[@iahelcathartesaura3887]

Paul Smyers I like the way you think!

[@giovannispinotti]

A minor imprecision: at 3:44 Steve correctly explains that the nodes are where there's no air movement, but at 6:50 he talks instead about pressure. In waves, pressure and velocity of air are inversely proportional, so maximum velocity corresponds to minimum pressure and vice versa, so for instance close to the wall the velocity of the air particles is zero but the pressure is at its peak. So in a node there's actually the maximum of pressure.

[@FreeAsInFreeBeer]

Is the explanation for the bottle correct? If so, then it would also work with your mouth replaced by a white-noise speaker, something I really doubt. The phenomenon is usually explained with Helmholtz resonance. As for the Rubens tube, I think it is great visually! But it also raises some questions that are unrelated to resonance (Why does more pressure variation produce more fire? Why is there fire everywhere when there is a sudden noise in the music?). Another great tool is an electric motor with a rope and a synced strobe-light (but is perhaps not so good on camera). I would love an explanation on the bottle-thing, and keep up the good work!

[@pubcollize]

A speaker at a size realistically-similar to a bottle won't move nearly as much air as your mouth. Regardless of what sound the speaker generates. If you place a funnel over a speaker in a club, or a over a stage-size guitar amp, you could get the same result.

[@MushookieMan]

A speaker doesn't produce a net flow of air like your mouth does, it merely vibrates the air. Steve's explanation made me cringe, sorry, it can't be right.

[@erzangel135]

You are right with the Helmholtz resonance, but wrong with the speaker. Because it's not about getting white noise out of your mouth, its about getting white (or really any, since noise is just a random appearance of all frequencies at statistical levels) noise at the corners of the bottle. (You can blow a bottle without making noise yourself). You can produce noise at the bottle, when the air flow gets disrupted at the corner, and in doing so, create all the frequencies. Since the resonance frequency of the bottle (only one!) is also included, it will bring the mass-spring system of the bottle into motion, leading to the resonance. All the other frequencies also bring it to motion, but since they are incompatible in frequency, they will lose their energy completely, becoming inaudible. It is like filtering the noise with a bell-shaped EQ with a big Q factor.

[@bunberrier]

Freeasinbeer more pressure is more fuel pushed out as Im sure you already know, but my guess is the variance in pressures happens much more quickly than the fuel can burn once emitted, so overall many incidences of high pressure meana bigger flame. In a way the flames are averaging the peaks.

[@jennifergrinder2602]

Harmonic overtones.

[@tjmmcd1]

This video gets 6 thumbs up (out of 5, btw). Actually seeing a visual representation helps people to really understand concepts far better than simple memorization of formulas and definitions. Like many others I'm sure, I had never even heard of a Rubens Tube; a visualization of resonance that should be mandatory for every school science class. Excellent presentation and deeply appreciated.

[@andreemcaldas]

10:58 Sheding tears, here! Very touching!!!

[@davidrell-dukai8250]

whats the song name?

[@onlyspam408]

@@davidrell-dukai8250 At Rest - Kevin MacLeod @alistairferguson6590 had mentioned it earlier.

[@debrisoliveira]

Finally someone REALLY explained why a tuning fork only ressonates at one frequency. It's a matter of adding amplitude to the frequency in which the fork's atoms already vibrates. Thanks a lot!

[@kutsen39]

At 9:40 I had just enough time to say "That's a ukulele" and you cut me off 😂 Talk about perfect timing!

[@mvdmusicvideostorefreshthe3224]

Hi Steve, I work in engineering, I'm not a designer of structures, but I have studied to a higher level and have an interest in how things affect structures. A problem with the Millenium Bridge was due to resonance I believe (I could be wrong and usually are))) this was where it started to sway because of the energy put in from the people walking in time on it matched the 'Natural Frequency' of the bridge. Yours is the second video where you have described what I thought was called Natural frequency, as you put it, it is the frequency that the object likes to vibrate at, but you call it 'Resonant Frequency.' I watched a lecture on earthquakes and it was excellent, it showed how buildings fall down, each building has it's own 'Natural Frequency' and if there's an earthquake and the vibrations of the quake 'match' the 'Natural Frequency' of the building, then you get a 'Resonant Frequency' that is my understanding, but it seems I might be wrong.

[@TheTechAdmin]

3:23 man I'd love to be your editor lol. Almost everytime you talk/teach, I picture the perfect digital graphic to display.

[@Hallowed_Ground]

Yeah he really does need an editor. So many great teaching moments that could be enhanced greatly.

[@noahway13]

The end was so powerful to me, now knowing how it all comes together. The science made it more emotional, more profound. Before, I would have thought that it was cool, but only for a few seconds. But knowing 'how' made it good on several levels. Like scientists who understand the universe have a sense of awe more profound than religious people who don't understand the complex workings of things.

[@crazydrummer4827]

Please do string instruments. I am really interested in that.

[@bolton368]

cello :)

[@jaguardestiny999]

...Says the drummer lol

[@ericscaillet2232]

@@jaguardestiny999 he wants to deflect,erm defect...

[@richardmg9]

Cool demonstration! I think you misspoke about nodes vs anti nodes. The flames are largest where the air column is oscillating and smallest where the pressure is oscillating. To help see this, notice that the high flame point would line up with the speaker, and the speaker is obviously moving air.

[@EsnorkelPS3]

9:23 3, 2, 1, shoenice

[@bellyegg]

underrated

[@StanislavMudrets]

It isn't just that the resonant frequency gets amplified as you keep supplying the air with white noise, thereby constantly disturbing the system, but that the other frequencies cancel each other and themselves out. This is a kind of overproduction of variants, random variation and natural selection taking place - with some frequencies, those that fit the environment, being accumulated (essentially getting bigger in amplitude) while those that aren't fit to their environment getting killed off over time (the amplitude being brought down to 0). As long as the air keeps getting supplied, the fit individual frequencies keep being accumulated. This is an equivalent to a single generation of evolutionary dynamics (as in random variation and selection) taking place.

[@MertKaanTorukojin]

9:41 if that's a guitar than that bottle was very big.

[@akymrinkovsky289]

This was the exact opposite of what I wanted. Yet it is one the coolest-things I've ever seen. Don't you just love it when that happens? 😁~ I do 🙏~ So just to be clear, ( I can get a 'Rubens Tube', gas, and connect it to the electric-piano and play the piano and make the fire behave/dance.) Wow 🙃~ I fu**in love it, I can see at least 4, applications for it, right now. Plus I pretty sure one way to promote, " The Science's " & " The Arts " ✨~ Is to make fire dance 🔥 ~ it's the coolest combination of science & music I've seen yet.

[@akshaymutalik2417]

I think a Reubens plane would be more interesting to look at

[@diegobaca2222]

but why stop there??? how about.....a reubens tetrahedron

[@OhSoUnicornly]

What about a Ruben's cube ;)

[@JayFe0]

Someone did a video on one. Veritasium maybe? I can't remember but it's out there.

[@rosieisla8286]

I think I've been missing too many numberphile videos, I was thinking about aeroplanes!

[@lakshaymd]

Yes it has been done, it's called pyro board and is real pretty. Only problem is 2d waves are really complicated and so its beauty is all most of us would be able to appreciate xD

[@allanrichardson1468]

In my high school electronics lab in 1963-64, the teacher did a similar demo with a 12 foot (4 m) device called a Lecher (LEK-er) Line, an open wire balanced (I.e. both conductors isolated from ground) transmission line. Since electrical power travels at close to “c”, he used a 144-148 MHz “signal generator” (a Heathkit Twoer lunch box sized 5 watt ham transceiver for use in the 2meter band; I imagine this demo was the educational justification to spend school funds on a piece of gear for the classroom’s ham shack; a cheap piece of gear, IIRC about $54 in 1962 money) The Lecher line can be open, shorted, or terminated in a resistive “dummy load” (NO ANTENNA ALLOWED under these conditions) at the end opposite the connection to the transceiver, and being open wire, additional short circuits and resistive loads of various values can be added at any point along the line. Instead of a butane flame, the high current spots can be detected with a fluorescent tube mounted near and parallel to the wires; the gas inside the tube glows where the current swings are highest. This helped us understand standing waves and the standing wave ratio (SWR) in transmission lines, which can cause inefficiency and even damage to the final amplifier of a real transmitter.

[@4amcuriosity162]

Very professional and informal video, thank u so much for being clear ! Really opened my eyes and described it all way better than others

[@TheForcesofDarkness]

In high school, I saw a similar effect in a science demo. Except it was to show the sound wave. Had a tube but only for the gas, drilled with little holes which were lit. The speaker was placed at the end so it would project over the flames. Then used a sound generator in a sine wave form. The wave moved the flames down or up depending on the frequency and moved when the frequency was changed like you would see on an oscilloscope. It was a really cool way to 'see' sound.

[@amitanaudiophile]

You are great steve. Thanks a lot . I like to know how we perceive sound in nature vs sound by stereo speakers and how to adjust two speakers to get natural reproduction (sound pressure waves) in home.

[@amitanaudiophile]

You can get additional help to the my topic from great upload on youtube " RMAF 14" by Bob Robin

[@elsindo]

It can be done by finding the best frequency with your surrounding resonance, and then adjust your virtual surround speaker to the same phase.. Don't mind me.. Sometimes I'm not sure what I talk about..

[@amitanaudiophile]

@@elsindo thanks

[@coldprime1019]

10:58 At Rest - Kevin MacLeod

[@JayPixx]

I'm new here and I'm so glad that I found another great science KZbinr. Btw what's the name of the song?

[@onlyspam408]

At Rest - Kevin MacLeod @alistairferguson6590 had mentioned it earlier.

[@vlasiosk]

This is the best science video I've seen in many years. And I watch way too many science videos. Good job with the visual aid. And any other vloggers out there, this is an easy pace to follow along with. If you find yourself having to speed through your content then you aren't doing a good job of being concise. Just the correct amount of info here.

[@jaime18638]

WTF when did you achieve 100k subscribers? :O Congrats Steve, you're fucking awesome :D

[@geraldmerkowitz4360]

He got recommended by Tom Scott a few weeks back :D

[@faustdownunder]

Excellent work. In connection with resonance, the terms "natural mode of vibration", "stored energy" and "excitation" are probably quite useful and appropriate. May I also mention the fine classic videos on the resonance effect by Lawrence Bragg in the RI series on YT.

[@johancahyadi6905]

Its remind me on Winamp visualization 😊

[@davestambaugh7282]

Over the last four years I have been trying to find out all about the design parameters of musical instrument strings. One of the biggest things I learned was the vast differences between strings for bowed instruments and strings for plucked instruments. On a guitar the energy is initiated and has to sustaine. With the bowed instrument the energy is constant as long as the bow is moving. That is why when you get violin strings they give you a rubber thing to deaden the one unwound string. With the bowed instrument you do not want the string to retain energy for to long. This is what the piano tech is dealing with when he voices the instrument.

[@leirbag75]

8:08 I was so disappointed at the word "water" there.

[@deadheadliving]

Learning has never been so easy with this Gem of a KZbin..bless you Sir!!!

[@noambarenholtz5804]

So the resonant frequencies are based on the harmonic series?

[@TheHumanHades]

One of my biggest science questions was that I know frequency and its cause, I know amplitude I know wavelength I know even speed what is this quality of sound. Why different people sound different even when they sing the same note. You have truly cleared my doubt by the simple concept of the different frequencies of white noise that don't get amplified and I am very grateful for it. Keep up the good work 😀😀

[@TheOpacue]

What's the name of the song you played in the end?

[@fabiofdez]

I notice that a standing wave is created when the standing wave creates a whole number of antinodes, and when a whole number isn't created the wave just evens out destructively, which is why it doesn't resonate. Interesting to see how the number of peaks went down by one as you swept down the range of frequencies and hit the resonating ones, going through 8, 7, 6, 5 peaks. Really neat!

[@libertypastor1307]

Enjoyed this very much! Watching the flames while the music played, made me wonder how it would respond to a voice speaking; which brought to my memory this passage of scripture that all of a sudden makes more sense! _Psalm 29:7 The voice of the LORD divideth the flames of fire._ I always loved watching the flames of a campfire dance, and split, and disappear. But invariably, they always remind me of hell. So now, this ominous thought comes, how that the Bible teaches that Jesus' soul went to hell after He died, but was not left there (see proof verses below), because He is infinite, and He could pay what we all owe (an eternity in hell) for our sins. But God will never force anyone to believe in Him, so He leaves with us the choice to believe His Word or not. If we do, He forgives our sins; if we don't, we must pay for them ourselves, and being finite creatures, will never finish paying. So, now I'm wondering that if His voice divideth the flames of fire, what will be the message (resonance) to those who reject Him as their Saviour while they suffer the torments of hell for rejecting the fact that He already suffered for them. Maybe their torment will be His voice saying, "I've already been here, out of love for you; but you refused to believe, so now you must resonate my torment and crying for all eternity!" Now that is terrifying! Thanks for the lesson you didn't know you were giving. God is all and in all - even in your video. Proof verses that Jesus soul suffered hell *for* us: _Psalm __16:10__ For _*_thou wilt not leave my soul in hell;_*_ neither wilt thou suffer thine Holy One to see corruption._ New Testament quote of Psalms 16: _Acts __2:27__,29-30 Because _*_thou wilt not leave my soul in hell,_*_ neither wilt thou suffer thine Holy One to see corruption._ _29 Men and brethren, let me freely speak unto you of the patriarch David, that he is both dead and buried, and his sepulchre is with us unto this day._ _30 Therefore being a prophet, and knowing that God had sworn with an oath to him, that of the fruit of his loins, according to the flesh, he would raise up Christ to sit on his throne;_ _31 _*_He seeing this before spake of the resurrection of Christ, that his soul was not left in hell,_*_ neither his flesh did see corruption._ _Isaiah 53:5,10,11 But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed._ _10 Yet it pleased the LORD to bruise him; he hath put him to grief: when _*_thou shalt make his soul an offering for sin,_*_ he shall see his seed, he shall prolong his days, and the pleasure of the LORD shall prosper in his hand._ _11 _*_He shall see of the travail of his soul, and shall be satisfied:_*_ by his knowledge shall my righteous servant justify many; for he shall bear their iniquities._

[@oliverqueen1812]

Excellent. Amen

[@unnunn12]

when you said 'at the speed of sound' i instantly fell in love

[@grzegorzcichosz8240]

Imagine masters like Chopin or maybe Mozart playing on a piano with flames like that...

[@Erik_Swiger]

Not mocking, but I was wondering about something more rock-and-roll. Or, really, just a dozen different styles of music. And vocal harmonies, and Yanni tunes, in particular. lol edit: Abba!

[@tandintshewang3464]

I can see sound energy can converted into heat energy with the help of the resonance process. It is very innovative sir, I really enjoyed watching it.

[@evelynesimon5758]

Is it because I am like a Rubens tube that binaurals make different part of me body feel weird?

[@meadish]

Tough to answer this simply, I think. The human body is a lot less regular in composition than a Reubens tube, and how we experience a particular stimulus is not exactly the same each time we experience it, in other words, our baseline emotional state, level of alertness, concentration, the thoughts that arrive and how we respond to them etc. all play into what kind of emotion we experience. And if we watch that emotion closely we will notice that the emotion itself is not static from moment to moment, either. It seems to me from my own observation that by simply placing strong consistent attention on a particular part of the body, we somehow alter that location to a certain degree. I don't know what actually happens materially, but I would speculate that the nerves and sensory cells around that area probably become more active?

[@swastikkanjilal2829]

This video also illustrates the icrowave resonators concept as well, if we imagine the audio waves being rf waves and the 1st resonating mode being activated. Thanks Steve.

[@efjay3183]

Timbre Tahm-bruh Tahm-ber Timber

[@ME-ru4hv]

@@delve_ well, whoever he is, he shouldn't cry wolf. One of these days a tree really will be falling!

[@ME-ru4hv]

The resurgence of ANALOGUE synthesizers has made everyone a self styled scientist

[@TheRealGirlWeeb]

"the timber changes" you sure you don't mean timbre (i don't see any wood in the bottle after all)?

[@meadish]

Like many other French words, 'timbre' in English always sounds a bit off without the proper nasal vowel (to a French ear, it can sound like you're saying 'tambre' or 'tombre'), and if you do pronounce it according to French, many people think you are annoying... so I kind of prefer 'timber' as a pronunciation in English, although it is technically non-standard and causes the confusion with lumber/wood. Ho hum.

[@tapiawilliamj7760]

Another interesting aspect to your demonstration is that the sound velocity of the gas will change the resonant frequency inside the tube. So changing the fuel to air mixture, or changing the fuel will change how the sound waves travel through that medium.

[@AndrewJJ-0114]

This is a brilliant video but I died a little inside when you pronounced "timbre" like "timber".

[@gideonmunnik7976]

Can relate XD

[@jonassalk1387]

Sweet Cheeses, It Didn't worry me . Like the spelling of litre and liter or fore and four , the world is so full of sophistry, it's quite pleasant to find people still innocent. I would have expected you, if anybody, could appreciate such honest a character trait.

[@AkamiChannel]

Who cares how it is pronounced, honestly? Just people who want to sound smarter than others. I looked it up long ago and saw two acceptable pronunciations. Have you visited every English-speaking corner of the Earth? Yes it is originally a French word but we don’t use French phonemes and 1/4 of English is from French anyway.

[@AndrewJJ-0114]

@@AkamiChannel Obviously nobody really cares how it is pronounced; hence why I started my comment by saying it was a brilliant video -- I was very clearly stating that the mispronunciation didn't affect my enjoyment of the video. But it's just a fun comment about a small "quirk" in his pronunciation -- the fact that you are so offended by it suggests you have a massive chip on your shoulder.

[@AkamiChannel]

JesusJuenger Not offended. I guess so, but I’m just saying it’s not a “quirk” if that’s the normal pronunciation in some place. I haven’t been to every place to say if it is or not.

[@BillyBob-bo9tn]

Steve has the best voice of any science KZbinr

[@CrazySteve113]

Nothing was poured out of a beaker. I'm disappointed.

[@JustOneAsbesto]

He poured a lot of pressurized atmosphere out of his mouth-beaker.

[@baruchben-david4196]

I want explosions.

[@shannondove96]

Baruch Ben-David if his smell of percentages would have been off, we might have seen one

[@kennethsizer6217]

I'd like to learn more about the explosion danger distribution around that 15% butane concentration.

[@duncanw9901]

U r great Steve.

[@nickdenardo6479]

as a drummer and budding sound engineer, this video explains a lot. very interesting. thanks for this.