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.

Click on an item to paste into clipboard or use clipboard symbol at end to clipboard all values

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 clipboard

See also: Air, Noble Gases, Periodic Table.