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
The Adventure of the Noble Bachelor The Adventure of the Noble Bachelor "The Adventure of the Noble Bachelor", one of the 56 short Sherlock Holmes stories written by British author Sir Arthur Conan Doyle, is the tenth of the twelve stories collected in "The Adventures of Sherlock Holmes". The story was first published in "Strand Magazine" in April 1892. The story entails the disappearance of Hatty, Lord St. Simon's bride on the day of their marriage. She participates in the wedding, but disappears from the reception. The events of the wedding day are most perplexing to Lord St. Simon as it seemed to him that his