Dynamics of unconfined spherical flames
  Using the soap bubble technique, we visualize the dynamics of unconfined hydrogen-air flames using high speed schlieren video. We show that for sufficiently weak mixtures, i.e., low flame speeds, buoyancy effects become important. Flame balls of a critical dimension begin to rise. The experiments are found in very good agreement with the scaling laws proposed by Zingale and Dursi. We report the results in a fluid dynamics video. 
Louis Leblanc, Maha Manoubi, Kadeem Dennis, Zhe (Rita) Liang, Matei I.   Radulescu
physics.flu-dyn