Today we did a very easy, quick science experiment. There are only 4 items that are needed: Bowl, Water, Pepper, and Dish soap.
First add some cool water to the bowl.
Sprinkle in some pepper.
Add a drop of dish soap to your finger.
Place your finger, with the dish soap on it, in the water in the middle of the bowl. And watch what happens...
Before you can even pull your finger out of the bowl all the pepper rushes to the sides. This is why:
"The pepper stays scattered all about the water because the water is pulling on the pepper evenly from all directions. When you drop the detergent into the water, it reduces the cohesiveness between the water and the pepper. In other words, it reduces the pulling action on the pepper and the pepper appears to run away from the detergent. But the water around the edges (untouched by the detergent) still has its full pulling strength." http://www.spartechsoftware.com/reeko/Experiments/ExpScatteringPepper.htm
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