A touch of dish soap changes the surface tension of milk, moving food dye on the surface in a Marangoni flow.

A touch of dish soap changes the surface tension of milk, moving food dye on the surface in a Marangoni flow.

By Devin Sakamoto for Fall 2015 Get Wet.
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Water gel beads (hydrophilic polymer) soaked in food dye are placed in milk. Flow is induced by soap (Marangoni flow) and by direct manipulation.
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Food dye in milk shows Marangoni driven flow when drops of soap are applied.

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