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Does anybody know how to work with these fluids? What are the pros and cons?

[Donaldson Tan]

A supercritical fluid is any substance at a temperature and pressure above its thermodynamic critical point. It has the unique ability to diffuse solids like a gas, and dissolve materials into their components, like a liquid. Also, it can readily change in density. These properties make it suitable as a substitute for organic solvents in a process called Supercritical Fluid Extraction. Carbon dioxide or water are used for this purpose.