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Queen Mary University of London
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Instant Freezing Water Trick
In this magic trick a container of water appears to freeze just by touching the surface of it.
The liquid is not water, but a super saturated solution of sodium acetate. Placing a few sodium acetate crystals on the tip of your finger and touching the liquid causes a chain crystallisation reaction. This is an example of an exothermic reaction. If you later apply heat to the crystallised sodium acetate, it will go back into solution ready to release that heat again when it recrystallises.
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