How to make a ruben A length of pipe is perforated along the top and sealed at both ends one seal is attached to a small speaker or frequency generator, the other to a supply of a flammable gas(Propane tank).The pipe is filled with the gas, and the gas leaking from the perforations is lit.If a suitable constant frequency is used, a standing wave can form within the tube.When the speaker is turned on, the standing wave will create points with oscillating(Higher and lower)Pressure and points with constant pressure(Pressure nodes)Along the 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 pressure nodes, the flames are higher.At the end of the tube gas christian louboutin outlet molecule velocity is zero and oscillating pressure is maximal, thus low flames are observed.It is possible to ... Read more »