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Reversible endothermic reaction

  1. Mar 20, 2016 #1
    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.
     
  2. jcsd
  3. Mar 20, 2016 #2

    Ygggdrasil

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    2017 Award

    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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