Oxygen, O2

Molecular weight g/mol: 31.999nbsp;
Purity: 99.9999% 
CAS: 7782-44-7 EC: 200-941-9 UN: 1072 (Compressed); 1073 (Refrigerated liquid) 
Typical Filling Pressure: 15 °C: 200 bar(a)    70 °F: 2,640 psi(g) 
Characteristics: Colourless and odourless gas. Many materials burn in oxygen that do not normally burn in air. Reduces the flash-point temperature and increases the combustion speed. 

Liquid State
Density at b.p. 1 atm kg/l:	1.1420
Density 20 °C kg/l:
Vapor pressure 20 °C bar:
Specific heat kJ/kg*K:
Rel.Spec.wgt, air=1 (15 °C.1 bar):	1.11
Density 15 °C 1 atm kg/m3:	1.35
Gaseous state
Specific heat (15 °C) kJ/kg* K:	0.916
Thermal conductivity µW/cm• K:
Solubility in water at P=1 bar l/kg:
Boiling point (1 atm)
Temp. °C:	-183.0
Heat of vaporization kJ/kg	213.3
Critical point
Temp. °C:	-118.6
Pressure bar:	50.43
Density kg/l:	0.4360
Flammability in air
Lower limit % volume:	n.a.
Upper limit % volume:	n.a.