دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. the part of a breathing medium, such as helium, that serves as a transport for oxygen and is DOl used by the body as a life-support agent. Its purpose is to dilute the flow of oxygen to the lungs, thereby preventing oxygen toxicity. 2. in chemistry, gases that have a fined outer electron shell and thus do DOl easily react with other substances. Examples are helium, argon, neon, and xenon.

n: a harmful reaction experienced by divers breathing extremely high partial pressures of oxygen. Divers may suffer from two forms: one affects the central nervous system;the other affects the pulmonary muscles. Because of these dangers, pure oxygen is not used as a breathing medium below 50 feet (15.2 metres) in commercial operations.