Liquefaction of gases low temperatures, using, for example, turboexpanders. The liquefaction of air is used to obtain nitrogen, oxygen, and argon and other atmospheric noble gases by separating the air components by fractional distillation in a cryogenic air separation unit. Air is liquefied by the Linde process, in which air is alternately compressed, cooled, and expanded, each expansion results in a considerable reduction in temperature. With the lower temperature the molecules move more slowly and occupy less space, so the air changes phase to become liquid. Air can also be liquefied by Claude's process in which the gas is allowed to expand isentropically
Life Among the Ruins bluesy hard rock and melodic metal, more similar to early Whitesnake's recordings than the epic power metal of albums like "Noble Savage" and the following "The Marriage of Heaven and Hell Part I". This is the first album with bassist Rob DeMartino, who replaced Joe O'Reilly, retired from the scene. All lyrics by David DeFeis, music as indicated Life Among the Ruins Life Among the Ruins is the fifth full-length studio album by US heavy metal band Virgin Steele. It was released in 1993, after almost five years of inactivity. The song "Snakeskin Voodoo Man" was present only in the