How I broke a wine glass with my VOICE (using science!) 

The glasses are breaking because they want to end their suffering, not because of the resonant frequency :)

I used to think resonance was the most boring part of physics because I wasn't interested in breaking wine glasses, but then I learnt how important it is in everything from laser systems to astrophysics

I love how at 6:57 when the glass broke off, it made a sound that is very similar in pitch to the Windows XP error sound. "Error. Glass.exe failed to maintain structural integrity. Press any key to continue."

This girl: *Screaming* Glass wine: *My time has come*

Yes, my roommates were in the house while I recorded this. They kept up a conversation downstairs, and paused for me to screech, then talked during the silences. And all was normal.

+Physics Girl Hi Dianna, I measured the frequency at 6:57 to be *649 Hz,* just as the wine glass broke (using a tuning app). It's interesting, you were singing at *652 +/- 1 Hz* from 6:47-6:55 and then dropped to about *642 Hz* up to *649 Hz.* As soon as you hit *649 Hz,* the glass broke. So maybe that is the resonant frequency

"don't try this at home" me immediatly runs to get a wine glass...

Best part of the video “so Diana, I’m trying to print a PDF” 😂

Hmmmm don’t try at home... can I try in a busy restaurant then?

I bet getting some of that glass in your eye really hertz.

omg 6:56 I've never seen one break like that and the sound the part that fell makes while falling, is cool

6:57 That look was priceless. It was the look of "Holy crap, it worked!" That anyone who has played around with material science knows. Also, the ding sounded like a Windows 95 error. :)

I'm just immediately reminded of the scene in Harry Potter with the Fat Lady.

Headphones + protection glasses + your face when the "new" glass broke = I had to pause and laugh my lungs out 😁. Great video Dianna!! 👍👏

Your neighbors must love you. lmao

"Don't try this at home. Go to a restaurant and do it."

OK, Google... 391.98 Hz please. Loud!

Our eight year old daughter is out of school because of snow. I showed her this video and she said "that was awesome!" Thanks Dianna!

Me a boy in puberty with voice changes:tries to make the same sound *walrus sounds intensifies*

"Amazing! Just with my voice!" "Fortuna Major"

6:58-7:02 The amount of "holy sh*t, did this realy happen" in her face is priceless.

i find there's a similar effect when you sing in the bathtub or in a shower stall. in a range of notes you might find a note that will jump out and sound a LOT louder than the rest even though you're singing at a fairly constant volume. bathrooms work better because of all the harder surfaces reflecting sound more than say, wallpaper or latex paints.

Wine glass: i am the only one that can do this note “aaaaa” Physics girl: “aaaaa” Wine glass: (getting jealous and breaks)

7:12 Imagine if the glass completely shattered cuz of that sound.

Happy physicsinging... ?

Dianna learns fast I can tell you! Awesome video!

Wine glass be like wine flass: CAUSE I'M ONE STEP CLOSER TO THE EDGE, AND I'M ABOUT TO.. *shatters*

People with perfect pitch: That’s a f not an e

1:58 ok... i’ll try it at a friends house

Another brilliant video Dianna, one of the few channels on RU-vid that just keep improving.

6:57-7:13 *When you actually get a decent score on a test you didn't study for* 😂😂😂

I love the stunned silence that goes on and on for more than 10 seconds from 6:58, you look like a toddler that just saw a kitten pop out of a box for the first time ever, absolute wonder and astonishment. Priceless, thankyou for making my day.

As a technology librarian, I fully appreciate the #dadTechSupport :D Too funny

Your happiness and shock at 1:40- I had the same reaction. Your videos are always awesome!

6:57 ERROR

I´m a teacher at elementary school in Germany. You are the perfect role model for the girls in my forth grade class! I will highly recommend your channel to them. Keep up your great work and thank you very much!

man she was so very surprised looking at the broken glass second time.....it was from 6:58-7:01..... she won that!!!!!

OMG, #dadtechsupport is too funny. LOOOVE your videos. If I had a physics daughter, I'd want her to be like you

"And if you shake something hard enough, it will eventually break"

1:48 Priceless reaction ever of Physics Girl ever!

hey diana can you make a video on general realtivity? how gravity effects time, and all that stuff.

In one word: Fascillating

Dianna, it might also just be a statistical thing too: you have to keep at it long enough to have let out the best pitch with the least phase noise for the longest time with the highest amplitude - like getting '7' '7' '7' after lots and lots of tries at a slot machine. So the real big test would be to pull out a brand-new wine glass, ping it with your fingernail to pick up its dominant frequency, then scream at it for only 5 seconds to break it.

It also helps if it’s crystal glass and not a normal wine glass as mike Boyd said in his video

Best episode yet Diana. Your face when the glass broke was hilarious. I am inclined to think that it was a combination of hysteresis and you finding the resonant frequency. As a note, if hysteresis is a factor, then the resonant frequency would have shifted as the crack grew.

or flick the glass a few times to 'check the frequency' when really you're trying to create those micro fractures

So easy and enjoyable to watch. My daughters are also tech support for me. Your Parents must be proud of you. Love from Australia. Thank you.

6:57 that reaction though. .. . . . Thanks for the great effort you gone through to make this video. ee..........ee.e.e.e.e......e....e.e.e.eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Diana why haven't we done a collaboration yet ?? " Physics Girl breaking a glass with her voice in Ultra Slow Motion". Perfect match !

6:57 I just loved the reaction and expression......

Hydraulic Press guy voice: The glass is extremely dangerous, and it may attack at any time, so we must sing to it.

Hey Dianna, just a thought; holding the glass with your hand may postpone the breakage. Because your hand damps the vibrations. This is like touching the head of the glass while it is vibrating. The noise perishes almost instantly. Maybe shouting it while its standing on a table could help, what do you think? Btw, great video as always :)

This is so cool! I love this Channel!!!!!

Isn't possible to make this whistling? I mean whistle frequencies are "more pure" than voices, and it's easier to keep doing it for a long time. Did you try?

I find your videos so funny and entertaining ! Thanks for posting and being so awesome !

Another odd but really cool use of resonant frequencies: Tearing trees out of the ground. When the trees at my parents house had to be cut (including the roots), we left several meters of trunk standing, and then dug up and cut all the roots surrounding the trunk. And then came the fun part: Tie a rope to the top of the trunk, and pull with just the right timing to get it to sway back and fourth. And after doing this often enough, you will tear out the roots that are inaccesseable. And that way, a single person can tear an entire tree out by themselves.

The part where Dianna has her headphones on and is just screeching had me dying, I was imagining what the neighbors would be thinking! This was amazing though!

Very nice vídeo! I'm Brazilian and learning English. Your videos are very good to learn new stuff and improve my English. Tks a lot!

That explanation about glass being supposed to be extremely strong was pretty mind blowing.

So worth it just to see the look on your face when it works.

You have a lovely voice, when does your album drop? :-)

I have a question. In movies or TV shows, they show high notes shattering glass (or crystal) from a significant distance. Is that possible or just "movie magic"? I love all your videos. Please keep it up.

I play upright bass, it reminds me of feedback. When I'm playing my bass through an amplifier and i am in a certain range or just the right (or wrong) place on stage compared to the direction the amplifiers are , the big hollow body instrument I'm holding will resonate and almost feel like it could break. And that's wood. It's not a wine glass but i believe it's the same concept. Also, really enjoyed how you explained things. Thank you. Thumbs up.

I love how silent you got at ~6:55 and just cherished the moment when it broke.

8:49 I can imagine your face Dianna... Whilst he explains this. 😯 wonder and 😀happiness

Could you theoretically break a glass with the octave (double the frequency?) of the resonant frequency, or would that decrease the amplitude?

When glass is made the cooling process and different thickness of glass from stem to bowl causes a preload tension. This tension is like a compressed spring frozen just before point braking so you don’t need to ad much energy to tip it over the threshold to crack it. You can design a glass with higher preloading will make a glass that is easier to brake. If you modify the ratio of rim to bowl of the glass in manufacturing and control the cooling process you should be able to make a super sensitive glass for braking.

Thank You Physics Girl for the demonstration of breaking a glas by singing a note. As an engineer and amateur mucician I have known this, but not being able to see it before.

2018 looking good

Here’s a burning physics question. If the event horizon of a black hole is the point at which it’s gravity becomes too strong for light to escape; then would the proximity of 2 black holes cause each other’s event horizon to decrease in radius (essentially helping to pull light/matter/energy out of its neighbor)?

Happy to see 2 of my favorite youtubers join in a video. When i saw the title my first thought was to comment Mike boyd did it first! But then i saw you 2 were together. Awesome!

Love you young lady!!!! I’m as old as your Dad! But I’m in to this stuff and still try to do my best at teaching our really young people!!

6:56, and most of us are “ok, done”……

Mel: But you know we want to try this. Just don't tell my mom.

You can try to record the noise the glass makes when hit and get the correct frequency and after that to play that frequency via a speaker (same volume/decibel level as your voice) and see if you still need as much time to break the glass. So you'll know which theory is correct. If the glass breaks in the first second you were inaccurate, if not, you need to weaken it first. I'll be curious of the result. Great vid by the way.

Thanks Dianna !! Brilliant & Honest demonstration of Resonance !! 👍🏻👍🏻

You should go do a colaboration with the slow mo guys about this subject :D It would be really COOOOL ! Thank from france :)

Awesome, congratulations!!! I know you said don't try this at home but, I'm sry I can't promise I won't. 😜😅🙏

What will happen when all the frequencies present in the whole spacetime resonates with the same amplitude? Pretty interesting question you should try to answer it.

Also, glass has some internal stresses and this can be seen with polarized light. It is why you anneal glass after working with it. It might be interesting to see if you can watch the stresses build in the glass with cross polarizing filters. Also I found it interesting that the brand new glass broke near the stem as opposed to the rim.

It is interesting to note that the frequency at which there is maximum amplitude of vibration is slightly lower than the resonance frequency

Actually, could answer your dads question... old people like us need to know!!!(;~ )

i love how much collaboration you do. cool to see the youtube community hangin out and makin cool videos.

it could be the energy not being able to be dissipated before more is added on which is why it rings when you stop and it doesn't break 6:30. It's oscillating with the energy it's been given and dissipating it as sound. At its resonant freq, the amount of absorbed energy is exponentialized. So with a higher tensile glass, you would have to sing at it longer at a time without is singing all of its energy back at you. So basically, outsing the glass at her best (tone) and she'll shatter.

Is it possible to make a flawless glass ball that would bounce against the floor and come away unharmed like your engineering friend said?

"EEEEEEeeeeeeeEEEEEEEEEEEEEEEE!" :D

And her face. When the glass actually broke. That pure astonishment! Like "wow... it DOES work!!!" 😲

I absolutely love your videos You Are very easy on the eyes and very intelligent not a combination that is calming in this day. Thank you for everything you do

#Kyleneedsayoutubechannel

Big up Mike Boyd

So late to the party... Perhaps this has been mentioned already by other commenters, but I wish you had related this to other practical applications of resonance. I know your concept was narrowly defined to an untrained vocalist being able to break a glass, but at least mentioning how resonance famously caused the destruction of the Tacoma Narrows bridge in 1940, or the necessary modification of the Millennium Bridge in London after 2000. The idea that wind through a canyon or the combined movement of pedestrians can gently increase in power enough to make steel and concrete swing like rope is a pretty amazing application of resonance in our world. It reminds us even the seemingly most solid structures need to be intensely scrutinized for potential weakness that may not be inherent to the design, but rather a consequence of outside forces in the exact context of where and under what circumstances the structures are built.

Can you do this in a lab setting using identical glasses but filling them with different liquids? Would be fun to see if the type of liquid used affected the glass’s resonating frequency.

Hey, finally I can break the glass after singing for a long time, hitting my teeth. So I found an easier formula, hit my teeth and break

"OMG, I irritated the glass to suicide!"

You could put a loud speaker to the resonant frequency, if it breaks fast, means it’s not material fatigue that makes the glass break, if it takes time then it is

Woh, It was boring performing in Physics Lab but now watching such an application totally killed it

"Eeeeeeeeeeeeeh............................AAAAAH!"

Love your videos, keep it up

I really liked that you also included a bit about the engineering side of this, that part was completely new to me.

I've noticed, sort of by accident, that if I sang an octave down, I could make the glass vibrate; I also noticed the same thing when I sang at TWO octaves down (I sang bass in a few a cappella groups.) I wonder if singing an octave or two (through voice or artificial means) in any direction would accomplish the same thing...