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Disposable hand warmers last for about 5 hours. The work because they have chemicals inside of the small pouch. The chemicals are a combination of iron, activated carbon, cellulose, vermiculite, water, and salt. The chemical change is called oxidation, which is similar to what happens when metal rusts. What happens is the user snaps the metal disc in the center, air enters the bag through tiny holes, which causes the crystals to precipitate. The heat of the warmer is in the solution, the precipitation releases the stored energy. This is how a hand warmer works.

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15y ago

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Do hand warmers really keep your hands warm in the winter months?

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