Chemical Symbol: O2
CAS Registry Number: 7782-44-7
DOT Classification: Nonflammable gas
DOT Label: Oxidizer
Transport Canada Classification: 2.2 (5.1)
UN Number: UN 1072 (compressed gas), UN 1073 (refrigerated
liquid)
U.S. Units
SI Units
Chemical formula
O2
O2
Molecular weight
31.9988
31.9988
Density of the gas at 70°F (21.1°C) and 1 atm
0.08279 lb/ft3
1.326 kg/m3
Specific gravity of the gas at 70°F (21.1°C) and
1 atm (air = 1)
1.105
1.105
Specific volume of the gas at 70°F (21.1°C) and
1 atm
12.08 ft3/lb
0.7541 m3/kg
Boiling point at 1 atm
-297.33°F
-182.96°C
Freezing point at 1 atm
-361.80°F
-218.78°C
Critical temperature
-181.43°F
-118.57°C
Critical pressure
731.4 psia
5043 kPa abs
Critical density
27.22 lb/ft3
436.1 kg/m3
Triple point
-361.82°F at
0.02147 psia
-218.79°C at
0.1480 kPa abs
Latent heat of vaporization at
boiling point
91.7 Btu/lb
213 kJ/kg
Latent heat of fusion at -361.1°F
(-218.4°C) melting point
5.959 Btu/lb
13.86 kJ/kg
Specific heat of the gas at 70°F (21.1°C) and 1
atm
Cp
0.2197 Btu/(lb)(°F)
0.9191 kJ/(kg)(°C)
Cv
0.1572 Btu/(lb)(°F)
0.6578 kJ/(kg)(°C)
Ratio of specific heats (Cp/Cv)
1.40
1.40
Solubility in water, vol/vol at
32°F (0°C)
0.0491
0.0491
Density of the liquid at boiling
point
9.52 lb/gal or
71.23 lb/ft3
1141 kg/m3
Density of the gas at boiling point
0.2799 lb/ft3
4.483 kg/m3
Gas/liquid ratio (gas at 70°F
(21.1°C) and 1 atm, liquid at boiling point, vol/vol)
860.5
860.5
While this information is presented in good faith and
believed to be accurate, GTS-Welco does not guarantee
satisfactory results from reliance upon such information.
Nothing contained herein is to be construed as a warranty or
guarantee, express or implied, regarding the performance,
merchantability, fitness, or any other matter with respect
to the products or processes, nor as a recommendation to use
any product or process in conflict with any patent. GTS-Welco
reserves the right, without notice, to alter the designs or
specifications of the products or processes described
herein.
