What are, and how do chemical ice paks work?

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paul.fr

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What are, and how do chemical ice paks work?
« on: 19/02/2008 00:02:19 »
What chemicals are used in ice packs? How do they react? and what type of reaction is it?

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Offline lightarrow

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What are, and how do chemical ice paks work?
« Reply #1 on: 20/02/2008 13:36:52 »
What chemicals are used in ice packs? How do they react? and what type of reaction is it?
Usually they were made of water and solid NH4NO3 (ammonium nitrate), which is a white salt that absorbs a lot of heat when it dissolves in water. When you compressed the envelope, another inner envelope containing water, broke, and the salt dissolved in it, lowering temperature a ten of degrees (down to -13.6 C, ideally).

There are many other compounds that absorb heat when dissolving in water; it was used that one also because it dissolves very quickly.