Argon (Ar) is a monatomic, chemically inert gas composing slightly less than 1% of the air. Its gaseous specific gravity is 1.38 and its boiling point is 302.6°F (185.9°C). Argon is colorless, odorless, tasteless, noncorrosive, nonflammable, and nontoxic. Commercial argon is the product of cryogenic air separation, where liquefaction and distillation processes are used to produce a low-purity “crude” argon product which is then purified to the commercial product.
Argon is used primarily for its properties as an inert gas in applications such as arc welding, steelmaking, heat treating, and electronics manufacturing.