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2. 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 ...

3. 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.

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. These Hand Warmers Keep Your Fingers Toasty for Yard Work ...

   www.aol.com/lifestyle/hand-warmers-keep-fingers...

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6. Catalytic heater - Wikipedia

   en.wikipedia.org/wiki/Catalytic_heater

   A catalytic heater is a flameless heater which relies on catalyzed chemical reactions to break down molecules and produce calefaction (heat). [1] When the catalyst, fuel (e.g., natural gas), and oxygen combine together, they react at a low enough temperature that a flame is not produced.

7. Phase-change material - Wikipedia

   en.wikipedia.org/wiki/Phase-change_material

   Common packaging materials showing chemical compatibility with room temperature PCMs include stainless steel, polypropylene, and polyolefin. Nanoparticles such as carbon nanotubes, graphite, graphene, metal and metal oxide can be dispersed in PCM. It is worth noting that inclusion of nanoparticles will not only alter thermal conductivity ...

8. Cold hands are common in winter. When are they a sign of a ...

   www.aol.com/lifestyle/cold-hands-common-winter...

   “The higher the blood flow, the flusher and warmer the hands get. The hands typically get cold when the body or the hand specifically is exposed to cold.” ... “Accomplish this by wrapping in ...

9. Flameless ration heater - Wikipedia

   en.wikipedia.org/wiki/Flameless_ration_heater

   The chemical reaction begins immediately, and takes about 12 to 15 minutes to heat a food pouch to about 60 °C (140 °F). It is recommended to place the bag within the cardboard carton the MRE is issued with to prevent injury, and to prop it upright so the water does not leak out and prematurely stop the reaction.