How to make water radiate light: sonoluminescence
One of the most mysterious and not very clear to modern science water properties is sonoluminescence. If bioluminescence is the ability of living organisms to emit light, then in this case light emits ... sound. Sound waves trap tiny cavitation bubbles in the water, causing them to contract and expand. The visual effect resulting from collapse is expressed in a flash of light. The Thought Emporium has shown how it happens in stages.
Sonoluminescence was first discovered in 1933. Her reasons are still a mystery. This is not surprising - the process is quite difficult to recreate (it took five years for youtuber to collect data and create the installation), and its practical use is small. For many years, physicists have suggested using it for medical purposes, submarine navigation devices, and even for fission. Alas, in practice, none of these ideas has justified itself.