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Hello there.
Two of my seniors in the AP Physics class were studying standing waves and they fashioned a Ruben's tube, which is a perforated pipe filled with gas, mounted at one end with a speaker driven by a function generator. The speaker sets the gas into motion and they see small flames in a standing wave pattern from the holes in the pipe. The question relates to the fact that they have had a few small fires that burn their speakers, and of course, are concerned about safety.
Question Date: 2004-03-10
Answer 1:

They should construct their tube out of non-flammable materials, of course. You also, I believe, need enough gas pressure coming out of the spigot and into the tube that the gas comes up out of the holes and does not stay in the tube where it can catch fire.

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