Instant cold pack
From Wikipedia, the free encyclopedia
An instant cold pack is a device which consists of two bags, one containing water which is inside a second bag containing ammonium nitrate. When the inner bag is broken by squeezing the package, the ammonium nitrate is allowed to dissolve in the water in an endothermic reaction. This reaction absorbs heat from the surrounding, and it significantly lowers the pack's temperature quickly.[1]
Instant cold packs are a convenient direct replacement for crushed ice used as first aid on sport injuries.
[edit] See also
[edit] References
- ^ Marshall Brain. Cold Packs. How Refrigerators Work. Howstuffworks.com.
