While soap added to dyed milk creates a Marangoni (surface tension) driven flow, a droplet of food coloring adds a Worthington jet upon impact with the surface.

While soap added to dyed milk creates a Marangoni (surface tension) driven flow, a droplet of food coloring adds a Worthington jet upon impact with the surface.

By Michael Bruha for Fall 2015 Get Wet.
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A Worthington jet, created by a droplet impacting a water surface, acts as a cylindrical lens, inverting the background image.
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A very large water droplet creates a crown splash on impact with a water pool.

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