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Nitrogen dioxide
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Nitrogen dioxide
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NO2
Nitrogen dioxide

Physical Properties

Under solid (grey), liquid (blue) and vapor states (white) along the equilibrium curves

  • General properties
  • Solid phase
  • Liquid Phase
  • Gas Phase
(P)
log(P)
Download
  • Molecular weight
    46.006
    g/mol
  • Content in air
    /

Critical Point

  • Temperature
    158
    °C
    316.4 °F 431.15 K
  • Pressure
    101.32
    bar
    1.0132E7 pa 1469.5218 lbf/in2 99.9951 Atm 1.0132E4 Kpa 7.5996E4 mmHg
  • Density
    557.717
    kg/m³
    34.8171 lb/ft³

Triple Point

  • Temperature
    - 11.25
    °C
    11.75 °F 261.9 K
  • Pressure
    1.8728E-1
    bar
    1.8728E4 pa 2.7163 lbf/in2 1.8483E-1 Atm 18.7283 Kpa 140.4742 mmHg
Pressure 1.013 bar
  • Melting point
    - 11.25
    °C
    11.75 °F 261.9 K
  • Latent heat of fusion (at melting point)
    318.437
    kJ/kg
    136.9951 Btu/lb 76.1083 kcal/kg
  • Solid density
    /
Pressure 1.013 bar
  • Liquid density
    1447.58
    kg/m³
    90.3693 lb/ft³
  • Boiling point
    21
    °C
    69.8 °F 294.15 K
  • Latent heat of vaporization (at boiling point)
    828.51
    kJ/kg
    356.4342 Btu/lb 198.0186 kcal/kg
Pressure1.013barTemperature
  • Compressibility factor Z
    /
    /
    /
  • Cp/Cv ratio γ
    /
    /
    /
  • Dynamic viscosity
    /
    /
    1.3311E-4
    Po
    13.311 µPa.s 1.3311E-5 PA.S 8.9446E-6 lb/ft/s
  • Gas density at boiling point
    /
    /
    /
  • Gas density
    /
    /
    /
  • Heat capacity at constant pressure Cp
    /
    /
    /
  • Heat capacity at constant volume Cv
    /
    /
    /
  • Liquid (at boiling point)/gas equivalent
    /
    /
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  • Solubility in water
    /
    /
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  • Specific gravity
    2.62
    2.62
    2.62
  • Specific volume
    /
    /
    /
  • Thermal conductivity
    /
    /
    12.961
    mW/m∙K
    7.4937E-3 Btu/ft/h/°F 1.1152E-1 cal/hour∙cm∙°C 3.0978E-5 cal/s∙cm∙°C 1.2961E-2 W/(m∙K)
  • Vapor pressure
    3.514E-1
    bar
    3.514E4 pa 5.0966 lbf/in2 3.468E-1 Atm 35.14 Kpa 263.5724 mmHg
    7.562E-1
    bar
    7.562E4 pa 10.9677 lbf/in2 7.4631E-1 Atm 75.62 Kpa 567.1982 mmHg
    1.2107
    bar
    1.2107E5 pa 17.5597 lbf/in2 1.1949 Atm 121.07 Kpa 908.1022 mmHg
NO2
Nitrogen dioxide

Liquid / Gas Volumes

Calculate a liquid or gas volume or a mass

Liquid Phase

At boiling point at 1.013 bar

m3(Volume)
kg(Mass)

Gas Phase

at 1.013 bar and boiling point

m3(Volume)
kg(Mass)
NO2
Nitrogen dioxide

Applications

Examples of uses of this molecule in Industry and Healthcare

Chemicals

Nitrogen dioxide is a strong nitrating or oxidizing agent in organic synthesis.

Chemicals

Laboratories & Research Centers

Nitrogen dioxide is used in calibration gas mixtures for petrochemical industry, environmental emission monitoring, industrial hygiene monitors and trace impurity analyzers

Laboratories & Research Centers
NO2
Nitrogen dioxide

Safety

Information to safely use this molecule

  • Major hazards
  • Material compatibility
  • GHS03
    Oxidising
  • GHS04
    Gas under pressure
  • GHS06
    Acute Toxicity
  • GHS05
    Corrosive

Threshold of toxicity

  • VME
    /
  • VLE
    3
    ppm
    or 6
    mg/m3
  • ILV-8h
    /
  • ILV 15mn
    /
  • TLV-TWA (USA)
    3
    ppm
    3 ppm 3.E-4 vol/% 3.E-6 vol/vol
  • TLV-STEL (USA)
    6
    ppm
    6 ppm 6.E-4 vol/% 6.E-6 vol/vol

Odor

Slightly irritating

Metals

  • Aluminium
    Not recommended
  • Brass
    Satisfactory
  • Monel
    Satisfactory
  • Copper
    Satisfactory
  • Ferritic Steel
    Satisfactory
  • Stainless steel
    Satisfactory
  • Zinc
    no data
  • Titanium
    no data

Plastics

  • Polytetrafluoroethylene
    Satisfactory
  • Polychlorotrifluoroethylene
    Satisfactory
  • Polyvinylidene fluoride
    Not recommended
    risk of explosion and fire
  • Polyvinyl chloride
    Not recommended
  • Ethylene tetrafluoroethylene
    Satisfactory
  • Polycarbonate
    no data
  • Polyamide
    Not recommended
    risk of explosion and fire
  • Polypropylene
    Not recommended
    risk of explosion and fire

Elastomers

  • Buthyl (isobutene- isoprene) rubber
    Not recommended
    risk of explosion and fire
  • Nitrile rubber
    Not recommended
    risk of explosion and fire
  • Chloroprene
    Not recommended
    risk of explosion and fire
  • Chlorofluorocarbons
    Not recommended
    risk of explosion and fire
  • Silicon
    Not recommended
    risk of explosion and fire
  • Perfluoroelastomers
    Satisfactory
  • Fluoroelastomers
    Not recommended
  • Nitrile rubber
    Not recommended
  • Neoprene
    Not recommended
  • Polyurethane
    Not recommended
  • Ethylene-Propylene
    Not recommended
    risk of explosion and fire

Lubricants

  • Hydrocarbon based lubricant
    Not recommended
    contamination of the material; risk of explosion and fire
  • Fluorocarbon based lubricant
    Not recommended
    contamination of the material

Materials compatibility

Recommendations : Air Liquide has gathered data on the compatibility of gases with materials to assist you in evaluating which materials to use for a gas system. Although the information has been compiled from what Air Liquide believes are reliable sources (International Standards: Compatibility of cylinder and valve materials with gas content; Part 1- Metallic materials: ISO11114-1 (March 2012), Part 2 - Non-metallic materials: ISO11114-2 (April 2013), it must be used with extreme caution and engineering judgement. No raw data such as these can cover all conditions of concentration, temperature, humidity, impurities and aeration. It is therefore recommended that this table is only used to identify possible materials for applications at high pressure and ambient temperature. Extensive investigation and testing under the specific conditions of use need to be carried out to validate a material selection for a given application. Contact the regional Air Liquide team for expertise service.

NO2
Nitrogen dioxide

Learn More

General information

More information

Nitrogen dioxide is a major air pollutant resulting from the reaction between nitrogen monoxide and the oxygen from air.