Reversible endothermic reaction

  • Thread starter HansVh
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  • #1
HansVh
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hi,

In the past there were "toys" containing a fluid and a clip. When pressing the clip, the fluid became hard and it gave warmth. When the toy was boiled in water, it became fluid again and one could start over.

Now I was wondering of there is a chemical reaction that gives cold instead of warmth. If there is no such reversible reaction, what is a good endotherm reaction that creates cold quick and with à low temperature.
 

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  • #2
Ygggdrasil
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Instant ice packs generally use the dissolution of a substance like ammonium nitrate or urea as an endothermic reaction. Not sure if you could get this to happen reversibly, however.
 

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