How to smash a wine glass with your voice

For reasons which will hopefully become clearer as the year goes on, my internet search history has been getting weird. Weirder than usual. Last year, I found myself searching things like “Linear Discriminant Analysis”, “Photosystem II”, “Electron transport chain” and “can you take ibuprofen and paracetamol at the same time?” (you can totally do that without dying by the way but I am by no means a medical professional).

This week, I’ve found myself looking for decidedly more fun things. Including the topic of today’s post: Can you break a wine glass with your voice?

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The answer is yes, but there are some caveats.

First of all, you need to be able to sing. Sound is essentially a vibration of the air around the object making the noise. The faster the vibration, the higher the sound and when I say “fast” I mean it. If you think about how fast you can wave your hand back and forth, you’d need to multiply that by about 20000 times to be able to hear your hand…. and you probably wouldn’t have a hand anymore…

Sound waves are what’s called “longitudinal waves”, meaning they move back and forth horizontally rather than, say, waves in the ocean which move up and down. When a thing makes a sound, it’s pushing the air out in really fast compressions. These compressions hit your ear and, through a complex process involving teeny tiny bones and millions of neurons, your brain converts them to sound. This is part of the theory behind the glass smashing. Point your horrifically powerful voice towards a glass and it starts to get bombarded by compressed air. The higher the sound, the faster the vibration which increases the amount of air hitting the glass and boom! It should explode.

But there’s actually one other thing happening; resonant frequency. If an object is hit with just the exact right pitch of sound, it will start to vibrate. Crystal glasses are really really good at resonating depending on the pitch of the sound. The more the glass vibrates, the more the molecules making it up are disrupted. If you hit a glass with a mallet, it makes a ringing noise. Match the frequency of the ring with your voice and you’ve got a very good chance of breaking it. Especially if it’s got a few cracks in it already.

So essentially, you need to be good, you need to be loud and you need to be very, very lucky. Like this guy on Mythbusters that one time. Awesome right?

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