These tubes are whirled in a circle and the difference in velocity between the swinging end of the tube and the end held in your hand produces a pressure gradient causing air to flow through the tube. The ridges in the tube disrupt the air flow and the tube "sings". The pitch depends on the speed of rotation. |
Equipment | ||||
---|---|---|---|---|
Plastic Singing Tube | Enclosed Plastic Whistle Tubes | |||