…showed first 75 words of 269 total…

…showed last 75 words of 269 total… an inert gas shield for arc welding in countries where helium is cheaper than argon  protective gas in growing silicon and germanium crystals, and in titanium and zirconium production  cooling medium for nuclear reactors  a mixture of 80% helium and 20% oxygen is used as an artificial atmosphere for divers and others working under pressure  cryogenic applications as a gas for supersonic wind tunnels  a protective gas for semiconductor materials pressurizing liquid fuel rockets Bibliography none