The spiral

 In this experiment we are going to be making a rotating spiral from paper

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#Experiments 10

You need

• A square of paper preferreble 15 cm square paper
• A pencil
• Scissors
• A piece of string about 20cm long
• A source of heat, such as a very hot radiator or an electric pan

What to do

1. Draw a spiral on the paper and cut along the spiral lines( illustrations in the picture below)
   
   
   
2. Make a little hole in the centre of the spiral. Thread the string through and fasten with a knot
3. Hang the spiral above the source of heat

What happens

The spiral begins to spin round on it's own

Because

.....the air is warmed up by the source of heat and rises up. As it comes in contact with the spiral, the air is channelled between the strips, pressing against the and making it spin round

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