Teaching the kids about surface tension and other cool science 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:
dish washing liquid
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.
Because the washing-up liquid reduces surface tension and allows the the particles of water at the surface to spread out more.