Science experiment: Surface tension
Teaching the kids about surface tension and other cool science-y things is more fun when you can show them. Grab your supplies and get ready for some great science fun in the kitchen.
What you need:
- small bowl
- ground pepper
- dishwashing liquid
- cocktail stick
Number of players:
Half fill a small bowl with water.
Sprinkle pepper on the surface of the water, forming a small layer.
With your cocktail stick, firstly dip this in the washing-up liquid.
Then dip the tip of the stick in the middle of the water.
As the washing-up liquid touches the water, what is happening to the pepper?
The pepper should spread out and merge together forming patterns.
Why? Because the washing-up liquid reduces surface tension and allows the the particles of water at the surface to spread out more.