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instant compress

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yamakazi:
hi everybody
i wanted to know how hot or cold compress works and what chemical reactions are used in that.
help me plz  

gregpawin:
Sorry for the late reply but I've been looking around for the specific reaction with no results.  Gosh my thermodynamics is rusty but this is an endothermic reaction...
dG=dH-TdS... so I'm thinking the entropy term dominates... I wonder if anyone could correct me on that.

Mitch:
Sandra is the resident expert on the reaction. I'll try to get her to post it again.

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