Argon is a rare atmospheric gas which is colorless, odorless, tasteless, and nontoxic. It is considered extremely inert and forms no known chemical compounds. The concentration of argon gas in the atmosphere by volume is 0.93%. Argon gas has numerous applications, including neon signs, lasers, incandescent and fluorescent lamps, electronic tubes, window insulation, welding, and semiconductor applications. Numerous purities of argon gas are available for specific industrial purposes.