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Originally Posted by mdntranger
Not being a scientist, I'm going to take a stab at this....
The amount of heat needed to change a given amount of liquid to a gas without a change in temperature is its HEAT OF VAPORIZATION, sometimes referred to as latent (hidden) heat. The heat of vaporization for water is 540 calories per gram (9720 cal/mole) and the heat of vaporization for ammonia is 327 calories per gram (5559 cal/mole).
As we all know, it is the evaporation process that makes you feel cool as heat is required for evaporation. Since it takes less heat to make ammonia evaporate (327 c/g), more ammonia can evaporate faster thus creating a cooler sensation than just water alone (540 c/g). Using an ammonia/water solution lowers the heat of vaporization of water (I'll leave that to the scientists to tell you the exact numbers) thereby making this solution 'cooler' than just water alone.
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Back off, wade. He's a scientist. 
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Dave
I haven't decided if I should call it from the dugout or the outfield. Apparently, both have really great views!
Screw green, it ain't easy being blue!
I won't be coming here that much anymore. I might check in now and again.
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