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argon |
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argon [ˈɑːgɒn] n (Chemistry / Elements & Compounds) 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 [from Greek, from argos idle, inactive, from a-1 + ergon work]
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| The atmosphere of the earth, we now know, contains far more oxygen or far less argon (whichever way one likes to put it) than does Mars. |
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