Atmospheric Pressure
Properties of Matter

Magic Apples

At home for 5-11 11-14


What you need

  • Two apples with stalks
  • Two pieces of string about 30cm long
  • Some sticky tape

Instructions

  1. Tie a piece of string to the stalk of each apple
  2. Use the tape to hang up the two apples so that they are about 6cm apart and free to swing
  3. Blow hard between the apples. What happens?

Results and Explanation

The apples move toward each other. Blowing reduces the air pressure in the gap between the apples. The air pushing on the outer sides of the apples makes them move into the area of lower pressure, so they move towards each other.

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.

Atmospheric Pressure
is a special case of Pressure
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