These whistling tubes, or ‘noise-makers’, are not only incredibly fun to play, but also demonstrate the fascinating physics behind music.
Play the instrument simply by twirling the red tube around in the air. When air moves through the tube, it produces a range of tones, loosely on the harmonic scale. This is caused by the air molecules within the tube bumping together, vibrating and producing sound waves. The faster you twirl it, the higher the tone that is produced.
This very simple item beautifully demonstrates ‘Bernoulli’s Principle’ – that fast moving air molecules create lower pressure. The idea is that the far end of the hose is moving much faster than the end being held so the higher pressure at the held end effectively sucks up air which in turn creates the whistle.
Wind whistlers are perfect for use as a group or as a classroom activity. It is made from 106cm length of strong red plastic tubing.