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Moving pepper flakes

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Uploaded by on Mar 2, 2008

Water is a fluid with a high surface tension. When a soap solution is added, it reduces the surface tension locally and this can have dramatic results. Here, a drop of soap solution is added to the center of a bowl of water containing pepper flakes sprinkled on the surface. The pepper flakes swiftly move towards the edges of the bowl. This phenomenon is called the Marangoni effect.

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Science & Technology

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