Quote:
Originally posted by Cyco-Dude
changing states (liquid to gas) is a physical change, not a chemical change, so its not an endothermaic reation. if you just had LN2 in a sealed container, it wouldnt be cold at all id think. kinda like those electronics dusters. they have a pressurized liquid inside (its not cold), but once you let some out, its expands to a gas and the can gets cold. :shrug:
i dunno, maybe some-1 who knows what they're talking about should shed some light on this LOL!! 
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I don't know hwere you learned chemistry, but it sure is an endothermic reaction. Physicial changes can have energy changes - some things when they dissolve are endothermic/exothermic.