ar·gon /ˈɑrˌgɑn/
 氬
 ar·gon /ˈɑrˌgɑn/ 名詞
 氬
 Ar·gon n.  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° C. and to a solid melting at -189.6° 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° C. and 760 mm., 1.7828 g.
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 argon
      n : a colorless and odorless inert gas; one of the six inert
          gases; comprises approximately 1% of the earth's
          atmosphere [syn: Ar, atomic number 18]
 argon
 Symbol: Ar
 Atomic number: 18
 Atomic weight: 39.948
 Monatomic noble gas. Makes up 0.93% of the air. Colourless, odorless. Is
 inert and has no true compounds. Lord Rayleigh and Sir william Ramsey
 identified argon in 1894.