Rubens tube

Where there is oscillating pressure due to the sound waves, less gas will escape from the perforations in the tube, and the flames will be lower at those points.

At the end of the tube gas molecule velocity is zero and oscillating pressure is maximal, thus high flames are observed.

Since the time averaged pressure is equal at all points of the tube, it is not straightforward to explain the different flame heights.

Based on Bernoulli's principle, the gas flow is proportional to the square root of the pressure difference between the inside and outside of the tube.

This original Rubens tube was a four-meter section of pipe with approximately 100 holes of 2 mm diameter spaced evenly along its length.

Tim Shaw on the show Street Genius on National Geographic Channel also featured one in Episode 18 "Wave of fire".

The artist Emer O'Brien used Rubens tubes as the basis for the sound sculpture featured in her 2012 exhibition Return to Normal at the Wapping Project in London.

[11] A 2D Rubens tube, also known as a pyro board, is a plane of Bunsen burners that can demonstrate an acoustic standing wave in two dimensions.

The 2D Rubens tube was made famous by a Danish science demonstrator group in Denmark called Fysikshow.

The rate at which the propane gas escapes through the holes on the top of the pyro board is dependent on the intensity of the input sound.