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Water Ping Pong

    Are you brave enough to hold this bottle of water directly over your head like Jonah has?

    Ingredients and equipment that you will need

    A glass milk bottle (preferably) or a wine bottle.
    A ping pong ball or other light ball

    Method and further information

    Do this over a jug or over the sink at first just in case!
    Fill the bottle right to the top with water.
    Put the ball on top
    Turn the bottle upside down (over a jug or sink to start with) and the water stays in the bottle.

    What is happening is that air is pressing on the ball and amazingly the pressure of air is stronger than gravity pulling the water down.

    Be careful – you should ask an adult to help you with these experiments. Do your experiments in old yoghurt pots, jam jars or bottle tops. Don’t use cups or glasses in case someone thinks it’s a drink.