What You Need:
- Sugar cube or cotton cloth
- Wooden matchsticks
- Fill a bowl with water and place a few matchsticks on top of the water to form a circle.
- Slowly dip the sugar cube or cotton cloth into the centre of the matchstick circle.
The matchsticks will come close together on the surface of the water. The matchsticks come closer (move in) as the sugar cube or cotton cloth absorbs some of the water and causes an increase in the surface tension.