Water thermometer

An easy way to make your own thermometer at home!



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Here is what you need, a glass bottle, a clear straw, cold water, food colouring, modelling clay, a container of hot water, Add food colouring to the bottle, Fill the bottle with water, Place the straw into the bottle, Hold it in the centre with the modelling clay, Place the bottle in the container, What do you think?, How does this thermometer work?
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