Helmholtz resonance

Have you ever blown over the top of a bottle to make a sound? This is called blowing over a bottle neck, and it creates a sound because of something called Helmholtz resonance.

Helmholtz resonance happens when you blow air across the top of a container with a hole in it. The air flows into the container, creating vibrations, and these vibrations produce sound waves.

Think of it like blowing up a balloon - when you let go of the mouthpiece, the air rushes out and creates a sound. This is just like what happens when you blow over a bottle neck. The air rushes in and creates sound waves, which we hear as a musical note.

So, Helmholtz resonance is the scientific explanation for why we can create sound by blowing across the top of a container with a hole in it.