Uploaded March 2014 | Updated September 2026, 3 weeks ago

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An explanation of why blowing in a bottle makes a sound, basically explaining how Helmholtz resonance works and how to bottles are Helmholtz resonators. The same explanation works for what role the speaker plays in moving objects/bottles using sound, the acoustic propulsion in one of my other videos below. This also explains a bit about resonant frequency and compares the sound wave compression and decompression to an oscillating spring, a simple harmonic oscillator.

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See also:

How to Move Things with Sound/Acoustic Propulsion
youtu.be/L5fVFA2sWt4

How to Make/Build a Lifter or Ionocraft
youtu.be/vzZy1Aqleno

Piezoelectric generator LED lit by rain water
youtu.be/laSQ6yd7jaE

And more of my sound related videos:

How to Make Music Instruments with Straws - Trombone and Trumpet
youtu.be/8zrsx8V8XwQ

Also see my webpage about moving things with sound and Helmholtz resonance:
rimstar.org/science_electronics_projects/moving_things_with_sound_helmholtz_resonance.htm

3D modelling and animation done using Blender 2.63.

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Music used:
Bicycle Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons.org/licenses/by/3.0
ISRC: USUAN1100870