Microbubble Necklace

When a drop impacts a pool at very low velocity, a thin layer of air can be trapped between the drop and the pool.  When this air film ruptures, a ring of microbubbles forms and expands.  Multiple “bubble necklaces” can form if the film ruptures at several points.  These rings travel outward until the film is completely destroyed, leaving a chandelier-like shape of microbubbles.  See the phenomenon in action with one of the videos linked here. (Photo credit: S. T. Thoroddson et al.; see video at arXiv)

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