An inert gas. One of the Noble gases. Used in light bulbs and to create an inert atmosphere for electric welding.


In 1895 the chemist William Ramsay and physicist Robert John Strutt (Lord Rayleigh) discovered Argon in liquified air.

Makes up about 1% of the atmosphere.

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Atomic number 18 Clip
Atomic / Molecular Weight 39.948 gmol-1Clip
Density 1.66 kgm-3Clip
Crystal Structure fcc Clip
Lattice constant 532 fmClip
Melting Point 83.76 KClip
Boiling Point 87.304 KClip
Specific heat capacity 519 Jkg-1K-1Clip
Latent heat of evaporation 158000 Jkg-1Clip
Ratio of Specific Heats 1.667 Clip
Thermal conductivity 0.0162 Wm-1K-1Clip
Refractive index 1.000281 at 589.3nm 101.3kPa 0CClip
Refractivity 0.000281 Clip
Velocity of sound 307.9ms-1 @ 0C ms-1Clip
Viscosity 0.000021 Nsm-2Clip
Kinematic Viscosity 1.26506024096386E-05 m2s-1Clip
Critical Temperature 151 KClip
Critical Pressure 4860000 PaClip
Critical Volume 0.0000752 m3mol-1Clip
de Broglie wavelength 0.000000000026 mClip
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See also: Air, Noble Gases, Periodic Table.

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Subjects: Chemistry