Oxygen - Thermophysical properties
Chemical, physical and thermal properties of Oxygen - O2 :
(Values at 25oC (77oF, 298 K) and atmospheric pressure)
| Molecular Weight | 31.9988 |
| Specific Gravity, air = 1 | 1.105 |
| Specific Volume (ft3/lb, m3/kg) | 12.24, 0.764 |
| Density of liquid at atmospheric pressure (lb/ft3, kg/m3) | 71.27, 1142 |
| Absolute Viscosity (lbm/ft s, centipoises) | 13.4 10-6, 0.020 |
| Sound velocity in gas (m/s) | 329 |
| Specific Heat - cp - (Btu/lboF or cal/goC, J/kgK) | 0.220, 920 |
| Specific Heat Ratio - cp/cv | 1.40 |
| Gas constant - R - (ft lb/lboR, J/kgoC) | 48.3, 260 |
| Thermal Conductivity (Btu/hr ft oF, W/moC) | 0.015, 0.026 |
| Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - (oF, 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 (oF, oC) | -361.1, -218.4 |
| Latent Heat of Fusion (Btu/lb, J/kg) | 5.9, 13700 |
| Critical Temperature (oF, oC) | -181.5, -118.6 |
| Critical Pressure (psia, MN/m2) | 726, 5.01 |
| Critical Volume (ft3/lb, m3/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.
Related Topics
• Material Properties
Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
Related Documents
Acetone - Thermophysical Properties
Chemical, physical and thermal properties of acetone, also called 2-propanone, dimethyl ketone and pyroacetic acid. Phase diagram included.
Air - Composition and Molecular Weight
Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts.
Air - Molecular Weight and Composition
Dry air is a mixture of gases where the average molecular weight (or molar mass) can be calculated by adding the weight of each component.
Benzene - Thermophysical properties
Chemical, physical and thermal properties of benzene, also called benzol. Phase diagram included.
Combustion Efficiency and Excess Air
Optimizing boilers efficiency is important to minimize fuel consumption and unwanted excess to the environment.
Critical Temperatures and Pressures for some Common Substances
Critical temperatures and pressures for some common substances like air, alcohol, ether, oxygen and more.
Cryogenic Fluids and Liquefied Gas Properties
Cryogenic properties as density, boiling points and heat of evaporation for fluids like hydrogen, methane, oxygen, nitrogen, fluorine and helium.
Ethane - Thermophysical Properties
Chemical, Physical and Thermal Properties of Ethane - C2H6.
Ethylene - Thermophysical Properties
Chemical, physical and thermal properties of ethylene, also called ethene, acetene and olefiant gas. Phase diagram included.
Feed Water Treatment to Avoid Corrosion
Make-up water to steam boilers should be treated with oxygen scavengers to avoid serious corrosion problems.
Gases - Densities
Densities and molecular weights of common gases like acetylene, air, methane, nitrogen, oxygen and others.
Gases - Explosion and Flammability Concentration Limits
Flame and explosion limits for gases like propane, methane, butane, acetylene and more.
Nitrogen - Thermophysical Properties
Chemical, Physical and Thermal Properties of Nitrogen - N2.
Oxygen - Density and Specific Weight vs. Temperature and Pressure
Online calculator, figures and tables showing density and specific weight of oxygen, O2, at varying temperature and pressure - Imperial and SI Units.
Oxygen - Dynamic and Kinematic Viscosity vs. Temperature and Pressure
Online calculator, figures and tables showing dynamic and kinematic viscosity of oxygen, O2, at varying temperature and pressure - Imperial and SI Units.
Oxygen - Enthalpy, Internal Energy and Entropy vs. Temperature
Enthalpy, internal energy and entropy of oxygen as an ideal gas.
Oxygen - Solubility in Fresh and Sea Water vs. Temperature
Solubility of oxygen in equilibration with air in fresh water and seawater (salt water) - pressures ranging 1 - 4 bar abs.
Oxygen Gas - Specific Heat vs. Temperature
Specific heat of Oxygen Gas - O2 - at temperatures ranging 175 - 6000 K.
Pentane - Thermophysical Properties
Chemical, physical and thermal properties of pentane, also called n-pentane. Phase diagram included.
Solubility of Air in Water
The amount of air that can be dissolved in water decreases with temperature and increases with pressure.
Solubility of Gases in Water vs. Temperature
Solubility of Ammonia, Argon, Carbon Dioxide, Carbon Monoxide, Chlorine, Ethane, Ethylene, Helium, Hydrogen, Hydrogen Sulfide, Methane, Nitrogen, Oxygen and Sulfur Dioxide in water.
Steel Pipes - Corrosion due to Oxygen
The influence of oxygen concentration and temperature on the corrosion of steel pipes.
Stoichiometric Combustion
Stoichiometric combustion and excess air.