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Definition of argon:

  1. 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 atC. and 760 mm., 1. 7828 g.
  2. A substance regarded as an element, contained in the atmosphere and remarkable for its chemical inertness.


ar, CFC, chlorofluorocarbon, atomic number 18, are.

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