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Some of that canned "air" is really a refridgerent known as R152a (difluorethane). When it is released it expands, and that is what does the cooling. Works just like your AC at home, except it's a different refridgerant.
By the way, even though it is not classified as "flamable", it burns like crazy when you light it. I've done tests... my "lab" wall has burn marks to prove it.
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Brian Graham
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