Air-activated handwarmers comprise cellulose, activated carbon, iron vermiculite and salt. When exposed to air, these produce heat from the exothermic oxidation of iron. The oxygen molecules present in the air react with iron and thus form rust. Salt is also added to catalyze/speed up the process.
Handwarmers are usually small packets. Players or sportsmen hold them in the hand to generate desired heat to warm cold hands. People generally use these during outdoor activities.
The perfect way to keep your hands warm. Moreover, these also maintain the softness of your fingers.
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