Dish soap on a pool of food dye drops the surface tension of oobleck, which pulls the spread of the dye.

Dish soap on a pool of food dye drops the surface tension of oobleck, which pulls the spread of the dye.

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By Christopher Francklyn for Spring 2013 Get Wet.
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Surface tension driven flow. Dish detergent dropped on food coloring in milk reduces local surface tension, which pulls the dye to the edges.
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Cigarette smoke is trapped under two glasses. The surface under the glass on the right was warmed, creating convection currents in the smoke.

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