A colorless, odorless, tasteless, gaseous mixture, mainly nitrogen(approximately78 percent) and oxygen(approximately21 percent) with lesser amounts of argon, carbon dioxide, hydrogen, neon, helium, and other gases. 空气一种无色、无嗅、无味的气体混合物,主要由氮气(约占78%)和氧气(约占21%)组成,还有少量的氩、二氧化碳、氢、氖、氦及其它气体
Suitable for MMA, argon arc, arc gouging welding. 可用于手工电弧焊、弧焊、弧气刨.
argon
[ noun ] a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere <noun.substance>
Argon \Ar"gon\, n. [NL., fr. Gr. ?, neut. of ? inactive; ? priv. + ? work.] (Chem.) A colorless, odorless gas occurring in the air (of which it constitutes 0.93 per cent by volume), in volcanic gases, etc.; -- so named on account of its inertness by Rayleigh and Ramsay, who prepared and examined it in 1894-95. Symbol, A; at. wt., 39.9. Argon is condensible to a colorless liquid boiling at -186.1[deg] C. and to a solid melting at -189.6[deg] C. It has a characteristic spectrum. No compounds of it are known, but there is physical evidence that its molecule is monatomic. Weight of one liter at 0[deg] C. and 760 mm., 1.7828 g. [Webster 1913 Suppl.]
Noble \No"ble\, a. [Compar. {Nobler}; superl. {Noblest}.] [F. noble, fr. L. nobilis that can be or is known, well known, famous, highborn, noble, fr. noscere to know. See {know}.] 1. Possessing eminence, elevation, dignity, etc.; above whatever is low, mean, degrading, or dishonorable; magnanimous; as, a noble nature or action; a noble heart.
Statues, with winding ivy crowned, belong To nobler poets for a nobler song. --Dryden.
2. Grand; stately; magnificent; splendid; as, a noble edifice.
3. Of exalted rank; of or pertaining to the nobility; distinguished from the masses by birth, station, or title; highborn; as, noble blood; a noble personage.
Note: Noble is used in the formation of self-explaining compounds; as, noble-born, noble-hearted, noble-minded.
{Noble gas} (Chem.), a gaseous element belonging to group VIII of the periodic table of elements, not combining with other elements under normal reaction conditions; specifically, {helium}, {neon}, {argon}, {krypton}, {xenon}, or {radon}; also called {inert gas}.
{Noble metals} (Chem.), silver, gold, and platinum; -- so called from their resistance to oxidation by air and to dissolution by acids. Copper, mercury, aluminium, palladium, rhodium, iridium, and osmium are sometimes included.
NASA plans to open Columbia's payload bay Friday to replenish the argon used to keep Astro's X-ray telescope cold.
Columbia's liftoff would have been delayed until at least Friday if the problem had not been solved by midnight Sunday, Young said. That's when workers planned to begin freezing the argon used to keep the X-ray telescope's instruments cold.
When completed in 1989, the plant will increase the argon capacity of the Pacific Northwest by 30%, the company said.