I understand that dry ice is just frozen co2, but how do they get the dry ice to those extremely low temperatures? I tried googling it but no satisfying answers came up. Can someone explain?
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The compression is used to make liquid co2. Dry ice is almost exclusively made from liquified co2. Moving co2 around as ice or gas (usually) doesn’t make sense is the reason.
At atmospheric pressure, liquified co2 turns to dry ice. It’s pretty simple stuff. It’ll spray out of a liquid tank as snow. It’s an instant conversion! You can also have co2 slush, which sounds fun but is a bad day to have if it happens.
My background is cryogenics, co2 isn’t really cryogenic by definition, but it’s cold enough it was in job scope.
It’s basically all food grade, even if there’s no testing papers along side of it. It has about 3x the cooling power of regular ice, doesn’t leave water behind and you can source it easily with a little search from places like walmart.
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