Instant cold pack
||It has been suggested that this article be merged into Ice pack. (Discuss) Proposed since August 2014.|
An instant cold pack is a device that consists of two bags; one containing water, inside a bag containing ammonium nitrate, calcium ammonium nitrate or urea. When the inner bag of water is broken by squeezing the package, it is allowed to dissolve the solid in an endothermic reaction. This reaction absorbs heat from the surroundings, quickly lowering the pack's temperature.
Instant cold packs can also be used to keep food fresh.
For safety reasons, instant cold packs have recently been developed without ammonium nitrate, but some companies still use ammonium nitrate.
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