This explains why there is no sound when the flame is heating the gauze: all air flowing through the tube is heated by the flame, so when it reaches the gauze, it is already hot and no pressure increase takes place.
To objašnjava zašto nema zvuka dok vatra zagrijava gazu: sav zrak koji prolazi kroz cijev se zagrijava pomoću plamena tako da dok dođe do gaze već je vruć i ne dolazi do povećanja tlaka.