How do hand warmers work?

Hand warmers are small packets that when shaken create heat. They are popular during winter months to provide heat for your hands. Some hand warmers can last longer than others depending on the type and source of the heat.

The most common type of hand warmers are air-activated hand warmers. These hand warmers contain a mixture of cellulose, iron, water, activated carbon, vermiculite and salt. They produce heat from the exothermic oxidation of iron when exposed to air. The oxygen molecules in the air react with iron, forming rust. Salt is often added to catalyze the process. They typically emit heat for 1 to 10 hours, although the heat given off rapidly diminishes after 1–2 hours.

Another new popular hand warmer are battery operated hand warmers. They use electric heating devices to convert electrical energy into heat from the battery. Typically hand warmers can heat for up to six hours. Rechargeable electronic hand warmers can be charged and used for much longer than a traditional hand warmer.




I think that rechargeable electronic hand warmers are the way to go. You will never have to buy another hand warmer and though it will have a higher initial price, the long term price will be lower. In addition when you buy hand warmers they are not reusable. Many people who use hand warmers just throw them on the ground or drop them when they are done. Electric hand warmers don’t pollute the environment making them a easy choice over regular hand warmers