- Stir a cup of hot chocolate and then tap the bottom of the cup. The sound changes as you tap. Why?
- Now make a different hot drink e.g. tea or coffee or just water. Stir and tap. What difference does it make? Why?
- Now add 2 spoonfuls of sugar to one of the drinks. What difference does it make? Why?
Challenge courtesy of Miss Monk – Try it out yourself and put your answers on a postcard… or more simply just post them as a comment right here!