Trying to learn no hands whistling, like doctor Cox.
That got me thinking about the concept, even with a normal coach whistle, is it the air escaping through certain shape that causes the sound, Or the air blowing in?
In: Physics
This is actually a very complicated question. Right now we are not entirely certain of exactly what the mechanism that makes the noise in human whistling is. But the leading theory is that the mouth serves as a resonating chamber which causes the air to vibrate in the mouth, and then all of these vibrations get compounded together into a single high-pitched sound as that air is leaving the mouth. This style of resonating is called a Helmholtz resonator
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