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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.
The release of heat is triggered by flexing a small metal disk in the hand warmer, which generates nucleation centers that initiate crystallisation. Heat is required to dissolve the salt in its own water of crystallisation and it is this heat that is released when crystallisation is initiated. [9] The latent heat of fusion is about 264–289 kJ ...
The warmers are about the size of a package of cards, and they contain chemicals which produce heat. One traditional hand warmer is a small metal box containing charcoal which, when lit, burns very slowly and produces a mild heat. Disposable heat packs typically contain cellulose, iron, water, activated carbon, vermiculite, and salt. When these ...
Therapist’s Choice Hydroculator Heat Packs $14.99 at Walmart. This moist heating pad “gets very hot and maintains heat well,” says Miro. To use it, the brand recommends heating the compress ...
Cats are generally more heat tolerant than dogs—after all, they love to seek sunny spots for a sunbath—but the dog days of summer are hot for your cat, too. Even though most kitties can ...
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A heat pack is designed to warm up one's body to prevent swelling of injuries. A heat pack can be: an ice pack that is heated (containing a liquid or a gel with high specific heat) a heating pad that heats when you start the crystallisation process
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