Standing Waves on a String. The Ruben Flame Tube. The Ruben Flame Tube Demonstration no.: 6 Purpose: To demonstrate that sound is made of pressure waves.
Summary: A metal tube is filled with gas which can leak out of small holes. The gas is lit and sound is sent into the tube by a loudspeaker. Keywords: Waves, longitudinal waves, sound, standing waves, oscillations. Standing wave in research wave tank. Dad making standing wave in circular pool.