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  2. Heating pad - Wikipedia

    en.wikipedia.org/wiki/Heating_pad

    A sodium acetate heat pad. Disposable chemical pads employ a one-time exothermic chemical reaction.One type, frequently used for hand warmers, is triggered by unwrapping an air-tight packet containing slightly moist iron powder and salt or catalysts which rusts over a period of hours after being exposed to oxygen in the air.

  3. Hand warmer - Wikipedia

    en.wikipedia.org/wiki/Hand_warmer

    Crystallisation-type hand warmer with scale showing metal disc trigger Short clip showing the activation and crystallisation of a crystallisation-type reusable hand warmer. This type of hand warmer can be recharged by immersing the hand-warmer in very hot water until the contents are uniform and then allowing it to cool. The release of heat is ...

  4. Sodium acetate - Wikipedia

    en.wikipedia.org/wiki/Sodium_acetate

    A hand warmer contains a supersaturated solution of sodium acetate which releases heat upon crystallization. Sodium acetate is also used in heating pads, hand warmers, and hot ice. A supersaturated solution of sodium acetate in water is supplied with a device to initiate crystallization, a process that releases substantial heat.

  5. #17 Heated Mouse Pad Hand Warmer: Because Nobody Likes Icy Fingers While Working Review: "I use to have pain in my mouse hand from the cold in my office, I’d have to stop working every 30mins or ...

  6. Phase-change material - Wikipedia

    en.wikipedia.org/wiki/Phase-change_material

    A sodium acetate heating pad. When the sodium acetate solution crystallises, it becomes warm. A video showing a "heating pad" in action A video showing a "heating pad" with a thermal camera. A phase-change material (PCM) is a substance which releases/absorbs sufficient energy at phase transition to provide useful heat or cooling.

  7. Flameless ration heater - Wikipedia

    en.wikipedia.org/wiki/Flameless_ration_heater

    To heat a meal, the bag is first torn open, and a sealed food pouch is placed inside. About 1 US fluid ounce (30 mL) of water is then added to the bag, using the line printed on the bag as a marker. The chemical reaction begins immediately, and takes about 12 to 15 minutes to heat a food pouch to about 60 °C (140 °F).

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