When one adds water to a Tibetan singing bowl and plays â€“ often by tracing the edge with a mallet â€“ the bowlâ€™s haunting sound is accompanied by ripples on the waterâ€™s surface. Thatâ€™s because the mallet pushes on the side of the bowl â€“ made from bronze alloy that is more malleable than glass â€“ and deforms it on a microscopic scale.
The deformation pushes on the air and the water, forming waves. The air waves are sound; the water waves race around the ring. If they are sufficiently excited, the waves break and eject droplets. The same happens in a wine glass, though at higher resonant frequencies.