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Originally Posted by live4ever
*edit* for anyone out there who's good at chemistry, another problem I found is that when you mix dry ice with water, it's an exothermic reaction which means that the dry ice will still be cold but it will be giving off heat into the water...
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As far as I know, no reaction is occuring. The dry ice just just melting faster because water conducts heat better than air. The dry ice still cools (and freezes) the water. If you don't believe me, drop a chunk of dry ice into a cup of cold water- it'll bubble and smoke for a bit, but then the water will freeze around the dry ice, giving it a coating of normal ice... eventually breaking and doing the bubbling thing again because the pressure from the gas breaks the normal ice.