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supercritical CO2 is kind of neat too
Indeed. However, I only know of one major use of the stuff - ever wonder how we decaffeinate coffee beans? Well, basically we stick them in a giant tank and pump in supercritical CO2, which dissolves the caffeine right out of them, but otherwise leaves them intact. After the beans have soaked long enough to give up most if not all of their caffeine, the CO2 is released and bubbled through another giant tank filled with water. Most of it makes it through all the way to the top and gets recycled for the next run, but some of it dissolves right in, yielding - you guessed it - carbonated, caffeinated water. So yeah, if you're the type of person who prefers his/her caffeine from sodas (like myself B)), be sure to thank someone who drinks decaf tea/coffee next time you enjoy one.