The coalescence cascade is the phenomenon by which a droplet of water merges together with a larger volume of water. After being gently deposited on the surface, the droplet sits for a moment before coalescing into the bottom layer. As the droplet merges, it results in the formation of a smaller droplet that then undergoes the same process. The timing of the coalescence steps is dependent upon the surface tension of the droplet and has been observed to repeat up to six times before viscosity begins to dominate the interaction.
Source: https://youtu.be/6KKNnjFpGto
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