An over pressurized bottle: Experiments in a vacuum pump are often demonstrated. Create a mechanism that demonstrates an additional phenomenon in high pressure. How would this phenomenon be manifested in the human organ of hearing?
A solution by a gifted student (found in the course of research): A test tube fixed in the over pressurized bottle is covered by a rubber membrane that bends due to overpressure (see Fig. 2). The overpressure is created with the help of a tyre valve in the neck of the bottle and an inflator. The rubber membrane simulates the behaviour of an eardrum while swimming or diving. The danger rests upon incidental failure of the eardrum due to a bump on the water surface or due to the pressure of the water column when diving.