[ad_1] noun Chemistry.
- a colorless, odorless, chemically inactive, monatomic, gaseous element that, because of its inertness, is used for filling fluorescent and incandescent lamps and vacuum tubes. Symbol: Ar; atomic number: 18; atomic weight: 39.948.
- an extremely unreactive colourless odourless element of the rare gas series that forms almost 1 per cent (by volume) of the atmosphere. It is used in electric lights. Symbol: Ar; atomic no: 18; atomic wt: 39.948; density: 1.7837 kg/m³; freezing pt: –189.3°C; boiling pt: –185.9°C
chemical element, 1894, Modern Latin, from Greek argon, neuter of argos “lazy, idle, not working the ground, living without labor,” from a- “without” (see (3)) + ergon “work” (see (v.)). So called by its discoverers, Baron Rayleigh and Sir William Ramsay, for its inert qualities.
n. Symbol Ar
- A colorless, inert gaseous element constituting approximately one percent of the earth’s atmosphere, used in electric bulbs and fluorescent tubes and in lasers used for opthalmic procedures. Atomic number 18.
- A colorless, odorless element in the noble gas group. Argon makes up about one percent of the atmosphere. It is used in electric light bulbs, fluorescent tubes, and radio vacuum tubes. Atomic number 18; atomic weight 39.948; melting point -189.2°C; boiling point -185.7°C. See Periodic Table.