Oxygen

A colourless and odourless element that is essential for most life forms on earth. The name is derived from the French oxygène, which means "acid generating".

Symbol

O

Also known as

Vital air.

Discovered

1774 Priestley publishes his work on oxygen.

Abundance

The most abundant element on earth, making up about 1/5 of the earth's atmosphere and 8/9ths of earth's oceans and almost half of the earth's crust.

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Atomic number	8		Clip
Mass number	16		Clip
Atomic / Molecular Weight	15.9994	gmol-1	Clip
Density	1.33	kgm-3	Clip
Lattice constant	683	fm	Clip
Melting Point	54.36	K	Clip
Boiling Point	90.198	K	Clip
Specific heat capacity	916	Jkg-1K-1	Clip
Latent heat of evaporation	243000	Jkg-1	Clip
Ratio of Specific Heats	1.395		Clip
Thermal conductivity	0.0244	Wm-1K-1	Clip
Refractive index	1.001711	at 589.3nm 101.3kPa 0°C	Clip
Acoustic wave velocity (Irrotational waves)	316	ms-1	Clip
Velocity of sound	332.2ms-1 @ 30°C	ms-1	Clip
Viscosity	0.0000192	Nsm-2	Clip
Kinematic Viscosity	1.44360902255639E-05	m2s-1	Clip
Critical Temperature	154	K	Clip
Critical Pressure	5080000	Pa	Clip
Critical Volume	0.000078	m3mol-1	Clip
de Broglie wavelength	0.000000000029	m	Clip
Electromotive Series	-0.397	V	Clip
Triple Point	54.361	K	Clip

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See also: Aerobic, Air, Anaerobic, Hydrogen Bonding, Ozone, Periodic Table, Slush Oxygen, Water.