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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As per the other answers, it is achieved through compression of the gas.
Through a process known as Charles’s Law, temperature increases as gas is compressed. The gas is then cooled and then decompressed, which has the opposite effect of compression, cooling and contracting the gas.
In addition to being the process used in refrigeration and most air conditioning, this process is used to liquefy a range of gases (such as liquid nitrogen). However, since Carbon Dioxide doesn’t really have a liquid state, it produces a solid instead.
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