why do air compressor cans become cold when you use them
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They cool off because the refrigerant inside (1,1-difluoroethane) is under pressure and boils off when the pressure lowers, and energy lost to the latent heat of vaporization cools the can a lot.
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Canned air is a common tool used for working on computers and general electronics. The strong puffs of air are handy for removing dust from the mouse and keyboard, monitors, fans and other equipment. If you have used canned air, you've noticed the peculiar reaction that occurs: the can gets cold and, in some cases, frost forms on the can and the straw attached to the nozzle.
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