How CO2 becomes dry ice due to pressure?
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Answer:
The Many Faces of CO2
Dry ice starts off life as carbon dioxide gas (CO2). From a gas, the CO2 needs to be converted into a liquid before it can become solid dry ice. In order to get the CO2 gas into a liquid, it is pressurized and refrigerated. Once it liquefies, the pressure is reduced causing some of the liquid CO2 to vaporize. As the CO2 vaporizes it causes a rapid decrease in temperature. All of the liquid CO2 that doesn’t evaporate is chilled enough to turn into a snowy substance. Technically, this is dry ice, but not like we’re used to seeing.
The Final Product
The dry ice “snow” is compressed, either into pellets or blocks, and then sold to be used for one of the seemingly endless number of uses for dry ice. These blocks or pellets are what you can expect when you purchase dry ice from a supplier.
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