ABSTRACT
The term “supercritical uid” (SCF) describes a gas or liquid at conditions above its critical temperature and pressure-in other words, above the critical point. Two researchers, Hannay and Hogarth, at a meeting of the Royal Society (London) in 1879, reported for the rst time the supercritical uids’ property of pressure-dependent dissolving power: the higher the pressure, the higher their dissolving power. They described and summarized their ndings as follows: “We have the phenomenon of a solid dissolving in a gas, and when the solid is precipitated by reducing the pressure, it is brought down as a ‘snow’ in the gas” (Hannay and Hogarth 1879). Those assertions gave rise to a series of disputes in subsequent society meetings.
