2 Comments

  1. Bill Funk on February 19, 2015 at 10:50 am

    I believe that’s a characteristic of the gelatin itself.
    As the bubbles contract, the pressures increase. The ignition is compression ignition of gasses within the bubble (sort of like a diesel engine uses compression to ignite the fuel).
    I’ve seen this in several Youtube videos.



  2. Adam on February 22, 2015 at 8:49 am

    It is actually sonoluminescence… a snippet from wiki:
    “single bubble trapped in an acoustic standing wave emits a pulse of light with each compression of the bubble within the standing wave”

    http://en.wikipedia.org/wiki/Sonoluminescence

    Smarter everyday does a bit on slow motion bullets underwater. He speculates it could be happening underwater as well, but possibly lighting effect from the shockwave.