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Why does a compressed air can get cold?

Updated: 9/16/2023
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14y ago

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When the can is held upright and activated, gas flows out through the nozzle. The pressure inside the can therefore drops, and is no longer sufficient to keep the contents as a liquid; so some of the liquid boils, until the equilibrium pressure is re-established. The vaporization of a liquid is endothermic, so heat is absorbed, and the can becomes cold.

http://en.wikipedia.org/wiki/Gas_duster

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Q: Why does a compressed air can get cold?
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