Dry ice is much colder than conventional water ice, as it sublimes (turns in to gas) at −109.2 °F (−78.5 °C). As the dry ice itself is at a much lower temperature, the items to be cooled can remain at a temperature far lower than freezing. Not only that, the “sublimes” part is also important – when it melts, you don’t get any liquid residue from itself like conventional ice. So there’s no mess to clean up.
On the other hand, the colder temperature also means it can freeze your body part to dangerous levels as well. In other words, you can get a frostbite much more easily. So it has to be handled with care.
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