Argon


Argon : (Symb: Ar or A) A noble gas element, bp -185. 7?C, mp -189. 2?C, and at. wt 39. 944. One of the constituents of the atmosphere. Used principally as a filler in electric lamps, as gas shielding for arc welding, and as a protective inert blanket in metallurgical processes. Argon is used also in Geiger counters and ionization chambers to detect ionizing radiation. See also: Air
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