When we pour some liquid in a closed container, for instance a jar or a bottle, we usually hear two (acoustical) noises: one is the classical turbulent (I guess white) noise, that in my view is closely related to the turbulence of the fluid flow as it starts hitting the bottom of the container. The other, is a very characteristic and coherent sound, that any of us learned to recognise as a child, and has an higher frequency as the fluid fills completely the container.
Now, the fact that the frequency increases should be explainable with the fact the fluid behaves as a wall for the remaining empty part of the bottle, thus creating a shorter and shorter closed pipe. At the nozzle, the water entering might have a behaviour resembling that of a blow or a whistle, and then I kind of imagine the the phenomenon as being the analogous of a person whistling in a pipe of a certain shape.
Am I right? Can anyone develop a little bit more the underlying reason for this behaviour? And also, is there any literature on this sound, on its dependence on the shape of the bottle and on the liquid used (the surface tension may influence the wall-behaviour of the free interface)?