This gas liquefaction process, pioneered by Raoul Pictet, liquefies a gas by using a series of other gases with progressively lower boiling points. The first gas is liquefied by 압력 at ambient temperature. Its evaporation is then used to cool and liquefy a second, more volatile gas, which in turn is used to cool and liquefy the target gas, creating a ‘cascade’ of cooling stages.





