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      Nitric oxide
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      Nitric oxide

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      Nitric oxide
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      Nitric oxide

      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
        30.006
        g/mol
      • Content in dry air
        3.477E-2
        ppm
         3.477E-2 ppm 3.477E-6 vol% 3.477E-8 vol/vol

      Critical Point

      • Temperature
        - 93
        °C
         - 135.4 °F 180.15 K
      • Pressure
        64.8
        bar
         6.48E6 pa 939.8442 lbf/in2 63.9526 Atm 6480 Kpa 4.8604E4 mmHg
      • Density
        517.35
        kg/m³
         32.297 lb/ft³

      Triple Point

      • Temperature
        - 163.65
        °C
         - 262.57 °F 109.5 K
      • Pressure
        2.189E-1
        bar
         2.189E4 pa 3.1749 lbf/in2 2.1604E-1 Atm 21.89 Kpa 164.189 mmHg
      Pressure 1.013 bar
      • Melting point
        - 161
        °C
         - 257.8 °F 112.15 K
      • Latent heat of fusion (at melting point)
        76.684
        kJ/kg
         32.9903 Btu/lb 18.3279 kcal/kg
      • Solid density
        /
      Pressure 1.013 bar
      • Liquid density (at boiling point)
        1280.84
        kg/m³
         79.96 lb/ft³
      • Boiling point
        - 151.77
        °C
         - 241.186 °F 121.38 K
      • Latent heat of vaporization (at boiling point)
        450.877
        kJ/kg
         193.9723 Btu/lb 107.7622 kcal/kg
      Pressure1.013barTemperature
      • Compressibility factor Z
        /
        /
        /
      • Cp/Cv ratio γ
        /
        /
        /
      • Dynamic viscosity
        1.7804E-4
        Po
         17.804 µPa.s 1.7804E-5 PA.S 1.1964E-5 lb/ft/s
        1.8603E-4
        Po
         18.603 µPa.s 1.8603E-5 PA.S 1.2501E-5 lb/ft/s
        1.9126E-4
        Po
         19.1255 µPa.s 1.9126E-5 PA.S 1.2852E-5 lb/ft/s
      • Gas density at boiling point
        /
        /
        /
      • Gas density
        1.3402
        kg/m³
         8.3666E-2 lb/ft³
        1.3402
        kg/m³
         8.3666E-2 lb/ft³
        1.3402
        kg/m³
         8.3666E-2 lb/ft³
      • Heat capacity at constant pressure Cp
        /
        /
        /
      • Heat capacity at constant volume Cv
        /
        /
        /
      • Liquid (at boiling point)/gas equivalent
        955.71
        mol/mol
        955.71
        mol/mol
        955.71
        mol/mol
      • Solubility in water
        /
        4.163E-5
        mol/mol
        3.477E-5
        mol/mol
      • Specific gravity
        1.04
        1.04
        1.04
      • Specific volume
        /
        /
        /
      • Thermal conductivity
        23.703
        mW/m∙K
         1.3704E-2 Btu/ft/h/°F 2.0395E-1 cal/hour∙cm∙°C 5.6652E-5 cal/s∙cm∙°C 2.3703E-2 W/(m∙K)
        24.859
        mW/m∙K
         1.4373E-2 Btu/ft/h/°F 2.1389E-1 cal/hour∙cm∙°C 5.9414E-5 cal/s∙cm∙°C 2.4859E-2 W/(m∙K)
        25.622
        mW/m∙K
         1.4814E-2 Btu/ft/h/°F 2.2046E-1 cal/hour∙cm∙°C 6.1238E-5 cal/s∙cm∙°C 2.5622E-2 W/(m∙K)
      • Vapor pressure
        /
        /
        /
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      NO
      Nitric oxide

      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

      in standard conditions (1,013 bar, 15°C)

      m3(Volume)
      kg(Mass)
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      NO
      Nitric oxide

      Applications

      Examples of uses of this molecule in Industry and Healthcare

      Laboratories & Research Centers

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

      Laboratories & Research Centers

      Hospital care

      Nitric oxide is used as vaso dilator for pulmonary arterial hypertension, as well as for lung function test.

      Hospital care
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      NO
      Nitric oxide

      Safety & Compatibility

      Information to safely use this molecule

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

      Threshold of toxicity

      • VME
        25
        ppm
         or 30
        mg/m3
      • VLE
        /
      • ILV-8h
        /
      • ILV 15mn
        /
      • TLV-TWA (USA)
        25
        ppm
         25 ppm 2.5E-3 vol% 2.5E-5 vol/vol
      • TLV-STEL (USA)
        /

      Odor

      Slightly irritating

      Metals

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

      Plastics

      • Polytetrafluoroethylene
        Acceptable
        risk of release of toxic vapor in extreme conditions (elevated temperature)
      • Polychlorotrifluoroethylene
        Acceptable
        risk of release of toxic vapor in extreme conditions (elevated temperature)
      • Polyvinylidene fluoride
        Acceptable
        risk of release of toxic vapor in extreme conditions (elevated temperature)
      • Polyvinyl chloride
        Not recommended
        risk of explosion and fire
      • Ethylene tetrafluoroethylene
        Satisfactory
      • Polycarbonate
        No data
      • Polyamide
        Not recommended
        significant loss of mass
      • Polypropylene
        Not recommended
        significant loss of mass; risk of explosion and fire

      Elastomers

      • Buthyl (isobutene- isoprene) rubber
        Not recommended
        significant loss of mass; risk of explosion and fire
      • Nitrile rubber NBR
        Not recommended
        significant loss of mass; risk of explosion and fire
      • Chloroprene
        Not recommended
        significant loss of mass; risk of explosion and fire
      • Silicone
        Not recommended
        risk of explosion and fire
      • Perfluoroelastomers
        Satisfactory
      • Fluoroelastomers
        Acceptable
        risk of release of toxic vapor in extreme conditions (elevated temperature)
      • Neoprene
        Satisfactory
      • Polyurethane
        Acceptable
        risk of release of toxic vapor in extreme conditions (elevated temperature)
      • Ethylene-Propylene
        Not recommended
        significant loss of mass; 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.

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      Nitric oxide

      Learn More

      General information

      More information

      Nitric oxide is a major air pollutant, mainly rejected by premises heating systems, cars, thermal power plants and incineration plants.