Oxygen (O 2 )

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Oxygen (O₂)
Categories:	Fluid; Pure Element
Material Notes:	Physical Form: Colorless Gas
Key Words:	O2
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Physical Properties	Metric	English	Comments

Density	0.001308 g/cc	0.00004725 lb/in³	Gas
Molecular Weight	31.999 g/mol	31.999 g/mol
Vapor Pressure	0.1000 bar @Temperature -200.5 °C	75.00 torr @Temperature -328.9 °F

Chemical Properties	Metric	English	Comments
Atomic Mass	15.9994	15.9994	1995
Atomic Number	8	8
X-ray Absorption Edge	23.301 Å	23.301 Å	K
Critical Pressure	50.43 bar	37830 torr
Critical Temperature	-118.56 °C	-181.41 °F
	427.75 °C	801.95 °F
Critical Density	0.438 g/cc	0.0158 lb/in³
Critical Molar Volume	73.0 cm³/mol	4.45 in³/mol
Electronegativity	3.44	3.44	Pauling
Ionic Radius	0.0900 Å	0.0900 Å	Crystal Ionic Radius for Valence +6
	0.220 Å	0.220 Å	Crystal Ionic Radius for Valence +1
	1.32 Å	1.32 Å	Crystal Ionic Radius for Valence -2
	1.76 Å	1.76 Å	Crystal Ionic Radius for Valence -1

Electrical Properties	Metric	English	Comments
Dielectric Constant	1.507 @Temperature -193 °C	1.507 @Temperature -315 °F

Thermal Properties	Metric	English	Comments
Heat of Fusion	13.8 J/g	5.94 BTU/lb	Enthalpy of fusion at normal melting point
Heat of Vaporization	213.1 J/g	91.68 BTU/lb	Enthalpy of vaporization at normal boiling temperature
Specific Heat Capacity	0.918 J/g-°C	0.219 BTU/lb-°F
Thermal Conductivity	0.00930 W/m-K @Pressure 0.100 MPa, Temperature -173 °C	0.0645 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature -280 °F	gas
	0.0184 W/m-K @Pressure 0.100 MPa, Temperature -73.1 °C	0.128 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature -99.7 °F	gas
	0.0263 W/m-K @Pressure 0.100 MPa, Temperature 26.9 °C	0.183 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature 80.3 °F	gas
	0.0337 W/m-K @Pressure 0.100 MPa, Temperature 127 °C	0.234 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature 260 °F	gas
	0.0410 W/m-K @Pressure 0.100 MPa, Temperature 227 °C	0.285 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature 440 °F	gas
	0.0481 W/m-K @Pressure 0.100 MPa, Temperature 327 °C	0.334 BTU-in/hr-ft²-°F @Pressure 14.5 psi, Temperature 620 °F	gas
Melting Point	-218.79 °C	-361.82 °F	At atmospheric pressure (760 torr)
Boiling Point	-182.95 °C	-297.31 °F
Heat of Formation	0.000 kJ/mol	0.000 kJ/mol	Gas

Optical Properties	Metric	English	Comments
Refractive Index	1.2243 @Temperature -183 °C, Wavelength 546 nm	1.2243 @Temperature -297 °F, Wavelength 546 nm

Component Elements Properties	Metric	English	Comments
Oxygen, O	100 %	100 %

Descriptive Properties
Appearance	Colorless Gas
CAS Number	7782-44-7
Solubility	Slightly Soluble in H₂O, EtOH and Organic Solvents

References for this datasheet.

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