The word \u201ccryogenics\u201d comes from two Greek words, \u201ckryos\u201d meaning icy cold, and \u201cgenes\u201d meaning to form. The term cryogenics was \ufb01rst used in 1875 and has come into general usage since 1955. Cryogenic temperatures are normally considered as below (-)100\u00baC.<\/p>\n
One of the major bene\ufb01ts of handling gases in lique\ufb01ed form is the enormous reduction in volume resulting from the liquefaction of gas. Savings are achieved because one cubic meter of lique\ufb01ed gas is equivalent to many hundreds of cubic meter of gas volume at normal pressure and temperature.<\/strong> Thus the handling of cryogenic \ufb02uids requires less container space. Cryogenic applications are found in the steel, space, re\ufb01ning, welding, chemical, glass, cement, food, electronics and medical industries. The principle gases include propane, ammonia, CO2, argon, oxygen, helium, hydrogen, nitrogen, ethane, ethylene, methane and chlorine.<\/p>\n