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've been thinking - it would be cold if it is a liquid under high pressure. Take fog horns for example - its a highly pressurized liquid that when you press the button ... the gas goes out rELALly fast. But if you press the button while tipping it upside down, the liquid comes out and its REALLY cold. All those things are the same like that.