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Sodium acetate trihydrate crystals have a melting point of 58 °C. When they are heated to around 100 °C, and subsequently allowed to cool, the aqueous solution becomes supersaturated. This solution is capable of supercooling to room temperature without forming crystals. By clicking on a metal disc in the heating pad, a nucleation center is formed which causes the solution to crystallize into solid sodium acetate trihydrate again. The bond-forming process of crystallization is exothermic, hence heat is emitted.
or for the regular joe explanation.
It's water in the pads, but made of special water molecules that hate thumbs. We'll call them "thumophobic" molecules.
When you squeeze the gel with your thumb and forefinger the thumbophobic water molecules fight like tracksuited single mothers in the Woolies sale to get away from the thumb.
As the water molecules rub against each other in the kerfuffle heat is created by the friction. This is what caused the pad to warm up.
When you boil them to get them ready for another go, the water molecules chill out in this small scale "hot bath" you have run for them, it gets them over the work they've done and they got to bed that night all ready to have another go tomorrow.
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∙ 12y ago
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How are heat and work similar and different?
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Click on the link below.
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How much work is done by the heat engine if it takes in 2000J of heat and rejects 1500J of heat?
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