A '''supercritical fluid''' is any substance at a [[temperature]] and [[pressure]] above its [[critical point (chemistry)|critical point]], where distinct liquid and gas phases do not exist. It can [[Effusion|effuse]] through [[solids]] like a [[gas]], and [[Solvation|dissolve]] materials like a [[liquid]]. In addition, close to the critical point, small changes in pressure or temperature result in large changes in [[density]], allowing many properties of a supercritical fluid to be "fine-tuned". Supercritical fluids are suitable as a substitute for [[organic compound|organic]] [[solvents]] in a range of industrial and laboratory processes. [[Carbon dioxide]] and [[water]] are the most commonly used supercritical fluids, being used for [[decaffeination]] and power generation, respectively.