The Rubens' tube, also known as the standing wave flame tube, or simply flame tube, is a physics experiment demonstrating a standing wave. It shows the relationship between sound waves and sound pressure.
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 molecule velocity is zero and oscillating pressure is maximal, thus low flames are observed. It is possible to determine the wavelength from the flame minima and maxima by simply measuring with a ruler.
How to make Rubens' Tube
Prepared by Dany Huot & Vorleak Ban
Rubens' Tube - Sound waves at various frequencies
Rubens' Tube - Collection Of Songs
Rubens' Tube - Sertab Erener - Everyway That I Can
Rubens' Tube - Destiny's Child - Story Of Beauty
Rubens' Tube - Hector El Fago - Rumba
Rubens' Tube - Queen - We Will Rock You
Rubens' Tube - Sean Paul - Can You Do The Work
Rubens' Tube - Shakira - Eyes Like Yours - Ojos Asi