When a vertical water jet enters a bottle, sound may be produced, and, as the bottle is filled up, the properties of the sound may change. Investigate how relevant parameters of the system such as speed and dimensions of the jet, size and shape of the bottle or water temperature affect the sound.
"Message in a Bottle" <https://pixabay.com/photo-1694868/>`_ by pixel2013 is licensed under CC0 1.0