Thursday, 14 February 2019

acoustics - Why is the sound of filling a container with liquid always the same regardless of container?


I found a similar question asking why the sound changes as fluid level changes. Foobarbeque's answer mentions Helmholtz Resonance, and that the frequency depends on cavity volume, length of neck and opening area.


My question is: why does the sound sound similar between vastly different vessels?


When I say "the sound", I am not sure of the correct term - is it the tone? pitch? I am assuming "frequency" mentioned above is correct, but I mean the note always seems to go from low to high - but through exactly the same range regardless of vessel size. That is, it is not the case that one vessel starts from a lower low, or another ends on a higher high. If I fill a 25L plastic drum with a hose, or a drinking glass from the kitchen tap or any other type of vessel, the range of notes appears to be identical regardless of vessel shape. Why? And can you describe exactly what is making the sound?




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