At home for 5-11 11-14
- Level Elementary
What you need
- A sheet of paper
- Cotton thread
- Cut a thick spiral shape in the piece of paper
- Make a hole in the centre and thread the cotton through it
- Hang the spiral above the radiator
Results and Explanation
The spiral should start to spin slowly. The radiator raises the temperature of the air around it, so the particles move more quickly and spread out. This means the air is less dense and rises upwards. The rising air pushes on the paper causing it to spin.
These experiments have not been specifically safety tested for home use but we believe them to be safe if the instructions are followed. Adult supervision or direction is recommended as appropriate. All experiments are carried out at your own risk.