Argon is monatomic, colourless, odourless, tasteless and nontoxic gas. Together with helium, neon, krypton, xenon, and radon, it constitutes a special group of gases known as the rare, noble or inert gases. Argon is present in the atmosphere at a concentration of 0.934% by volume at the earth s surface. Air is the only known source for the production of pure argon. Argon is the most commonly occurring of the rare gases. APPLICATION OF ARGON GAS Steel Industries Lighting Shield Gases Gas Metal ARC Welding Plasma ARC Cutting Welding Other Market