Argon
An inert gas. One of the Noble gases. Used in light bulbs and to create an inert atmosphere for electric welding.
- Symbol
- Ar
- Discovered
- In 1895 the chemist William Ramsay and physicist Robert John Strutt (Lord Rayleigh) discovered Argon in liquified air.
- Abundance
- Makes up about 1% of the atmosphere.
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| Atomic number | 18 | Clip | |
| Atomic / Molecular Weight | 39.948 | gmol-1 | Clip |
| Density | 1.66 | kgm-3 | Clip |
| Crystal Structure | fcc | Clip | |
| Lattice constant | 532 | fm | Clip |
| Melting Point | 83.76 | K | Clip |
| Boiling Point | 87.304 | K | Clip |
| Specific heat capacity | 519 | Jkg-1K-1 | Clip |
| Latent heat of evaporation | 158000 | Jkg-1 | Clip |
| Ratio of Specific Heats | 1.667 | Clip | |
| Thermal conductivity | 0.0162 | Wm-1K-1 | Clip |
| Refractive index | 1.000281 | at 589.3nm 101.3kPa 0°C | Clip |
| Refractivity | 0.000281 | Clip | |
| Velocity of sound | 307.9ms-1 @ 0°C | ms-1 | Clip |
| Viscosity | 0.000021 | Nsm-2 | Clip |
| Kinematic Viscosity | 1.26506024096386E-05 | m2s-1 | Clip |
| Critical Temperature | 151 | K | Clip |
| Critical Pressure | 4860000 | Pa | Clip |
| Critical Volume | 0.0000752 | m3mol-1 | Clip |
| de Broglie wavelength | 0.000000000026 | m | Clip |
paste all data into clipboardSee also: Air, Noble Gases, Periodic Table.
Subjects: Chemistry