This experiment teaches about surface tension.
- Black pepper (ground not kernels)
- Dish Soap
- Pour water into a plate or bowl
- Shake the pepper on top of the water until a thin layer covers the top
- Dip your finger into the pepper and water… what happens?
- Now, put a drop of dishwasher soap onto your finger and dip your finger in the plate… what happens now?
- Surface tension is the force that causes molecules on the surface of a liquid to be pushed together and form a layer.
- In this experiment, the soap breaks the surface tension that makes the pepper float on top of the water.
- This causes the water molecules to move away from the soap, and pepper molecules go with them.