2500 Bunsen burners and sound wave imaging

In different countries, popularizers of science carry out very spectacular and spectacular experiments that attract a large number of ordinary people to scientific issues. The other day an interesting video was posted on the Web, where a very advanced version of Rubens' pipe was shown (on Habré, by the way, a post on how to make a Rubens pipe was already published).


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This is what Wikipedia tells us about Rubens' pipe: “The length of the pipe is perforated. One end connects to a small speaker, and the other to a source of flammable gas (propane tank). The pipe is filled with combustible gas, so that the gas seeping through the holes burns. If a constant frequency is used, then a standing wave can form within the pipe. When the speaker is turned on, areas of high and low pressure are formed in the pipe. Where, due to sound waves, there is an area of ​​increased pressure, more gas flows through the openings and the flame height is greater. Because of this, you can measure the wavelength by simply measuring the distance between the peaks with a tape measure. ”

So, in the experiment in question, not one pipe with holes was used, but the whole system consisting of 2500 burners. The whole system is called Pyro Board.

This whole system very effectively reacts to a change in pressure, due to the influence of sound waves, and we can literally "see" the sound.