sonoluminescence

This effect, called sonoluminescence, can create instantaneous temperatures hotter than the surface of the Sun.

…on the known phenomenon of sonoluminescence. In sonoluminescence a gas bubble is imploded with high-pressure sound waves. At the end of the implosion process, and for a short time afterward, conditions of high density and temperature are achieved that lead to light emission. By starting with larger, millimetre-sized cavitations (bubbles)…