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EZ heat

brianmay27
in Chemistry

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I have wondered how this product works forever.it is this little packet that you can buy at REI. it is a clear liquid with a metle disk in it. when you slap the disk it heats up and turns into a solid. then you can boil it and it can be reused. it contanes sodium acetate (food grade [if that helps :rolleyes: ]) and water. i asked all my science teachers and well nothing. any idias

Sodium acetate (plus a bit of water) requires heat in order to go from a solid state to a liquid. During this time, the sodium acetate "stores" the energy. In addition, the liquid state is remarkably stable, even well below the point of crystallization (which is around 50C, I forgot the exact temperature). When you flex the metal disc, which contains a small bit of sodium acetate, crystallization occurs, and the heat that was stored up is released.

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