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Liquid layers

    Floating liquids

    Some liquids can float on top of others! Check this out in this experiment.

    Ingredients and equipment that you will need

    Tall thin jar
    Food colouring
    Small plastic counters

    Method and further information

    Pour glycerine about a third of the way up the jar. Now carefully pour in some water until it’s two thirds of the way up. Now – pour on babyoil.

    Water floats on glycerin and baby oil floats on water, so you can make three layers if you pour them carefully.

    Drop some small plastic counters or other bits in and see if you can find something that floats where each of the layers meet.

    Mix food colouring with a bit of water and pour it in. It will colour only the water layer in the middle giving you a water sandwich.

    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.