I Made a Lens, But for Sound

I forgot to say "refraction" at any point during this video! So yeah... "refraction". Thanks for the idea Zach!

Next video: acoustic lasers, using modulated ultrasonic speakers

4:04 my brain: "how do you make concave balloons?" "Blow concave breaths"

That was way cool. Thanks Steve!

Steve's wife: Shall we sort the garden out. Steve: Yeah, gimme a minute.

Just today I read an article about sulphurhexofluoride, which is today's most potential green house gas in use. Until 2005 it was used in sound dampening windows panes. I wondered how it works, but didn't bother to look further into it. But now with your video it suddenly came to me that the heavy SF6 leads to total internal reflection between the glass panes, therefore converting the sound into heat. Amazing coincidence!

I found this video interesting and honestly encouraging. I never felt like I was very adept at studying physics in school or even in college, but I always wanted to be an engineer. It's explanations like this that lay out exactly how and why it works that has built my confidence to be an engineer in the aerospace industry today. Not once did you say "Snell's Law"; you just showed the behavior step by step, and that's how I learn best.

Exactly the perfect kind of information I'll probably never find a use for, but somehow don't know how I ever lived without! I can already see my loved ones' boredom as I try to explain how awesome this is! Liked, subscribed, all that!

5:47 You´re such a troll i love it

Oh gosh ! It opens up so many possibilities. I'm thinking : can we make a sound prism ? That could be a way to do some kind of physical Fourier transform. Idk, my knowledge is lacking in this field.

Thank you for giving me a spectacular AHA moment. The visual explanation of refractive index made so many things clearer for me. There rest of the video was excellent and informative as well.

I taught physics for several years and I have never seen this demo. SUPER well done and I can't wait to try it!

"ironically, it sounds just like a balloon deflating." Simon Cowell, is that you?

You are a dedicated man. I loved the explanation of the slower to faster wavelengths and the shapes of the lens that you showed. Everything you were saying instantly clicked in my head! What a cool experiment

Using a non-leaking balloon to focus the sound of a leaking balloon (white noise). This is one of the only times I’ve heard someone correctly point out “irony”, rather than “situational irony”. Love the experiment and information!

Great video! The way you present the experiments has me working through the outcomes in my head, trying to predict the outcome. Definitely fun! Thanks...be safe!!

Can you expand on the project? Try and make a "beamed" sound that you can only hear if you are in line with the "beam"?

I mean you wouldn't be lying if you said click the link for 30% off

Yes!! I love Brave Browser also this was a really cool and unique video, thank you

Back in the '70s JBL made some brilliant lenses for their midrange horns. The idea wasn't to focus the sound like you'd use an optical lens to fry ants. These lenses were designed to make an efficient horn behave like a point source so the radiation pattern was more like the other drivers. Because these were mechanical devices you could see what was going on. The sound coming from the middle was allowed to pass through mostly unobstructed, while the sound from the edges was delayed by slanted or corrugated metal plates. The resultant wavefront was similar to what a dome driver would make. And because it was purely physical, you could see how it worked.