Rubens Tube Standing Waves
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A Rubens Tube is a classic physics demonstration. The device is simply a tube with a source of propane on one side, a speaker on the other, and a bunch of holes along the length.
When the speaker outputs certain tones, the sound waves bouncing around the inside of the tube set up standing waves with areas of high and low pressure.
The higher pressure areas force propane out faster and makes a larger flame.
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Music: "Still Alive", a song with lots of sustained, computer generated tones that happen to be of the right frequency to react with the tube.
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