- Shallow bowl
- Water
- Pepper
- Dish soap
- Toothpick or a finger
- Paper
- Pencil
- Fill the bowl with water.
- Sprinkle pepper evenly across the surface.
- Squeeze a tiny bubble of dish soap onto a clean counter.
- Touch the tip of your finger to the bubble of dish soap.
- What do you think will happen when you touch your soapy toothpick to the water? How will the pepper flakes react?
As the soap moves into the water, and the surface tension changes, the pepper no longer floats on top. But the water molecules still want to keep the surface tension going, so they pull back away from the soap, and carry the pepper along with them.
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