Avalanches of popping bubbles in collapsing foams
  We report acoustic experiments on foam systems. We have recorded the sound emitted by crackling cells during the collapsing of foams. The sound pattern is then analyzed using classical methods of statistical physics. Fundamental processes at the surface of the collapsing foam are found. In particular, size is not a relevant parameter for exploding bubbles. 
N.Vandewalle, J.F.Lentz, S.Dorbolo and F.Brisbois