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I bought Reusable Hand Warmers from Amazon https://amzn.to/3WjybTO Several packs of reusable hand Warmers (full of a liquid mixture of Sodium Acetate and Water). Its melting point is about 58 degree C ( about 136 F) now we are at room temperature (about 23 degrees C) and still it is liquid. Liquid, that is still liquid below its freezing point is a supercooled liquid. It is metastable and it is between two states, liquid, and crystal. Once a supercooled liquid begins to freeze, it will freeze quickly. And as it freezes it gives off heat energy. Like and subscribe for more science videos. Disclosure: As an Amazon Associate I earn from qualifying purchases. Your purchases through affiliate links help to generate revenue for this channel. There is no additional charge to you! Thank you for supporting the Channel so I can continue to provide you with free content each week!