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Oxygen - Thermophysical properties

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Oxygen phase diagram

Chemical, physical and thermal properties of Oxygen - O2 :
(Values at 25 oC (77 o F, 298 K) and atmospheric pressure)

Oxygen - Thermophysical properties
Molecular Weight 31.9988
Specific Gravity , air = 1 1.105
Specific Volume ( ft 3 /lb, m 3 /kg ) 12.24, 0.764
Density of liquid at atmospheric pressure ( lb/ft 3 , kg/m 3 ) 71.27, 1142
Absolute Viscosity ( lb m /ft s, centipoises ) 13.4 10-6 , 0.020
Sound velocity in gas ( m/s ) 329
Specific Heat - c p - ( Btu/lb o F or cal/g oC, J/kgK ) 0.220, 920
Specific Heat Ratio - c p /c v 1.40
Gas constant - R - ( ft lb/lb o R, J/kg oC ) 48.3, 260
Thermal Conductivity ( Btu/hr ft o F, W/m oC ) 0.015, 0.026
Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - ( o F, oC ) -297.3, -182.97
Latent Heat of Evaporation at boiling point ( Btu/lb, J/kg ) 91.7, 213000
Freezing or Melting Point  at 1 atm ( o F, oC ) -361.1, -218.4
Latent Heat of Fusion ( Btu/lb, J/kg ) 5.9, 13700
Critical Temperature ( o F, oC ) -181.5, -118.6
Critical Pressure ( psia, MN/m2 ) 726, 5.01
Critical Volume ( ft 3 /lb, m 3 /kg ) 0.040, 0.0025
Flammable no

Follow the links below to get values for the listed properties of oxygen at varying pressure and temperature :

See also more about atmospheric pressure , and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure ,
as well as Thermophysical properties of: Acetone , Acetylene , Air , Ammonia , Argon , Benzene , Butane , Carbon dioxide , Carbon monoxide , Ethane , Ethanol , Ethylene , Helium , Hydrogen , Hydrogen sulfide , Methane , Methanol , Nitrogen , Pentane , Propane , Toluene , Water and Heavy water, D2O .

Oxygen is a gas at standard conditions. However, at low temperature and/or high pressures the gas becomes a liquid or a solid.

The oxygen phase diagram shows the phase behavior with changes in temperature and pressure. The curve between the critical point and the triple point shows the oxygen boiling point with changes in pressure. It also shows the saturation pressure with changes in temperature.


At the critical point there is no change of state when pressure is increased or if heat is added.

The triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.

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