Answers: Disposable hand warmers turn up the heat in your mittens by means of an exothermic reaction that, in essence, just creates rust. Each pouch typically contains iron powder, salt, water, an absorbent material, and activated carbon. -or- The chemical reaction that takes place in hand warmers is exothermic, meaning it releases excess energy as heat. That's why you can mix a few chemicals to warm your hands!
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