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Soap disrupts the surface tension of water. So if you have fine particles floating in water (I personally use parsley flakes, which float better than pepper does) and you put a tiny trace of soap on your finger, and then touch the water, it breaks the surface tension at that point - but the surface tension of the water on the OTHER side of the flake is unchanged. The surface tension pulls the flakes away from the soap.

So the flakes aren't running away - they are being released from the surface tension!

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Q: Why does the pepper run away when soap is added?
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