How Does Reusable Hand Warmers Work. Disposal hand warmers dont just keep humans from getting too cold. Boiling the used packet restores the solution to its.
The solution must be heated well above its melting point. Types of Hand Warmers. Featuring Professors Martyn Poliakoff and Roger BowleySodium Acetate and Hand WarmersOur thanks to the Google Making Science team.
As the crystals spread the stored heat energy of the solution is released heating the hand warmer up to 54C an exothermic reaction.
The hand warmer can be reset by boiling it in a pan of water to liquefy. Usually theyre a plastic pouch filled with water and sodium acetate a cool chemical that is held in the pouch as a liquid that would much rather be a far warmer solid. If youve ever used the bulkier but reusable hand warmers they work a bit differently. You have to burn charcoal.
