Liquid argon is tasteless, colorless, odorless, noncorrosive, nonflammable, and extremely cold. It is monatomic and extremely inert, forming no known chemical compounds.. Liquid argon has a boiling point of –303°F (–186°C). It is widely used in the lighting industry for filling bulbs and with combinations of other rare gases for the filling of special bulbs and tubes for special color effects. The welding industry uses argon as a shielding gas to protect metal from oxidation during welding. Argon is also used extensively in the semiconductor manufacturing process as a purge gas.