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Why does a propane tank get covered in ice after being used?

Answer

As you use the tank, the pressure inside goes down. As the pressure drops, the temperature also drops because of something called the Ideal Gas Law (see the "Ideal Gas Law" Related Questions linked the left of this answer). Ice forms on the tank because water moisture in the atmosphere is condensed on the cold tank and then frozen.

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First answer by JEK. Last edit by JEK. Contributor trust: 2302 [recommend contributor]. Question popularity: 16 [recommend question]

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