= Rubens tube
{wiki=Rubens_tube}
A Rubens tube, also known as a flame tube or a standing wave tube, is a demonstration apparatus often used in physics to visualize the relationship between sound waves and pressure variations. It consists of a long metal tube with holes along the top, filled with a flammable gas, such as propane or methane. Here's how it works: 1. **Sound Waves**: A loudspeaker is placed at one end of the tube, generating sound waves that travel through the air inside the tube.
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