#2013 +(-23)-

Fel-Helper - Got it. The bubble produces light because the incoming soundwave heats up and expands the gas inside the bubble before it collapses back in on itself. This rapid expansion and compression actually turns the gas into superheated plasma, which is why it bursts out ultraviolet light.
Recorded on Friday, the 27 day of February, 2015, at 2:06 AM.

Public ><> . o O ( Your MOM is why it bursts out ultraviolet light! )