Sonoluminescence: A Star in a Jar!
source: As I see it! Patti Dail
image source: Sonoluminescence: A Star in a Jar!
"Sonoluminescence is the emission of short bursts of light from imploding bubbles in a liquid when excited by sound."
"Sonoluminescence can occur when a sound wave of sufficient intensity induces a gaseous cavity within a liquid to collapse quickly. This cavity may take the form of a pre-existing bubble, or may be generated through a process known as cavitation. Sonoluminescence in the laboratory can be made to be stable, so that a single bubble will expand and collapse over and over again in a periodic fashion, emitting a burst of light each time it collapses. For this to occur, a standing acoustic wave is set up within a liquid, and the bubble will sit at a pressure anti-node of the standing wave. The frequencies of resonance depend on the shape and size of the container in which the bubble is contained."
source: Sonoluminescence - Wikipedia