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The Mini-Mini Hand Warmers Thermodynamics Chemistry Demonstration includes packets containing iron, water, cellulose, vermiculite, activated carbon and salt. When released, the iron oxidizes and generates heat. This heat lasts up to seven hours!

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Each Mini-Mini Hand Warmers packet contains iron, water, cellulose, vermiculite, activated carbon and salt. When taken out of its sealed pouch, the iron will immediately oxidize and generate heat. This “heat source” will last up to seven or more hours and may reach temperatures as high as 150 ºF (60 ºC). Amazing example of chemistry in action. Package of 2. Teacher instructions provided.