Noun
compression wave (plural compression waves)
(physics) Any wave that is propagated by the compression of a fluid; examples include sound
A little more than a ‘neutral’ amount of air enters the tube and causes a compression wave to travel back up the tube (image 4). Source: Internet
However at this time, either because the compression wave ‘bumped’ the reed or because of the natural vibration cycle of the reed, the gap opens and another ‘puff’ of air is sent down the pipe. Source: Internet
When played loudly, the reed can spend up to 50% of the time shut. citation The ‘puff of air’ or compression wave (around 3% greater pressure than the surrounding air ) travels down the cylindrical tube and escapes at the point where the tube opens out. Source: Internet