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Experiment with surface tension

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Surface tension is a property of the surface of a liquid that allows it to resist an external force. With a little pepper and soap you can see for yourself how surface tension works — and how it's destroyed.

Shake some pepper, carefully, into a cup of water. If you let it fall lightly on top of the water, many of the flakes will stay afloat. They'll wander around, dimpling the surface. Keep going until a good portion of the surface is covered in pepper.

Once you've peppered your water nicely, take a bar of soap and dip it into the center of the water. The moment you do, the pepper all around it should make a run for the hills. Some flakes will drop into the water and to the bottom of the cup. Some will just jet over to the sides. Does pepper hate soap?

link: An experiment with surface tension

**related: Cause an eruption

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