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Helmholtz resonance
phenomenon of air resonance in a cavity / From Wikipedia, the free encyclopedia
Helmholtz resonance or wind throb is air resonance in a cavity. Examples:
- Blowing across the top of an empty bottle.
- Whistling
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/8/80/Helmholtz_resonator.jpg/640px-Helmholtz_resonator.jpg)
The name comes from a device created in the 1850s by Hermann von Helmholtz, the Helmholtz resonator. He used it to find the various frequencies or musical pitches in music and other complex sounds.[1]