Cubic Face Centered
-111.75°C = -169.15°F = 161.4 K
-108.04°C = -162.472°F = 165.11 K
16.58°C = 61.844°F = 289.73 K
1.24 Å (Å = Angstrom = 10-10 m)
(Gr. argos, inactive) Its presence in air was suspected
by Cavendish in 1785,discovered by Lord Rayleigh and Sir
William Ramsay in 1894.
Argon gas is prepared by fractionating liquid air. The
Earth's atmosphere contains 0.94% argon. Mars' atmosphere
contains 1.6% Argon-40 and 5 ppm Argon-36.
Argon is used in electric lights and in fluorescent tubes,
photo tubes, glow tubes, and in lasers. Argon is used as
an inert gas for welding and cutting, blanketing reactive
elements, and as a protective (nonreactive) atmosphere for
growing crystals of silicon and germanium.