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Nitrous oxide
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Nitrous oxide
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N2O
Nitrous 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
    44.013
    g/mol
  • Content in air
    /

Critical Point

  • Temperature
    36.37
    °C
    97.466 °F 309.52 K
  • Pressure
    72.45
    bar
    7.245E6 pa 1050.798 lbf/in2 71.5026 Atm 7245 Kpa 5.4342E4 mmHg
  • Density
    452.011
    kg/m³
    28.2181 lb/ft³

Triple Point

  • Temperature
    - 90.82
    °C
    - 131.476 °F 182.33 K
  • Pressure
    8.785E-1
    bar
    8.785E4 pa 12.7416 lbf/in2 8.6701E-1 Atm 87.85 Kpa 658.931 mmHg
Pressure 1.013 bar
  • Melting point
    - 90.82
    °C
    - 131.476 °F 182.33 K
  • Latent heat of fusion (at melting point)
    148.57
    kJ/kg
    63.9165 Btu/lb 35.5091 kcal/kg
  • Solid density
    /
Pressure 1.013 bar
  • Liquid density
    1230.458
    kg/m³
    76.8148 lb/ft³
  • Boiling point
    - 88.47
    °C
    - 127.246 °F 184.68 K
  • Latent heat of vaporization (at boiling point)
    374.286
    kJ/kg
    161.022 Btu/lb 89.4565 kcal/kg
Pressure1.013barTemperature
  • Compressibility factor Z
    9.928E-1
    9.9391E-1
    9.9453E-1
  • Cp/Cv ratio γ
    1.2933
    1.2853
    1.2804
  • Dynamic viscosity
    1.3631E-4
    Po
    13.631 µPa.s 1.3631E-5 PA.S 9.1596E-6 lb/ft/s
    1.436E-4
    Po
    14.36 µPa.s 1.436E-5 PA.S 9.6495E-6 lb/ft/s
    1.4841E-4
    Po
    14.841 µPa.s 1.4841E-5 PA.S 9.9727E-6 lb/ft/s
  • Gas density at boiling point
    2.982
    kg/m³
    1.8616E-1 lb/ft³
    2.982
    kg/m³
    1.8616E-1 lb/ft³
    2.982
    kg/m³
    1.8616E-1 lb/ft³
  • Gas density
    1.9774
    kg/m³
    1.2344E-1 lb/ft³
    1.8724
    kg/m³
    1.1689E-1 lb/ft³
    1.8084
    kg/m³
    1.1289E-1 lb/ft³
  • Heat capacity at constant pressure Cp
    8.5873E-1
    kJ/(kg.K)
    2.0524E-1 BTU/lb∙°F 858.73 J/kg∙K 2.0524E-1 kcal/kg∙K
    8.7347E-1
    kJ/(kg.K)
    2.0876E-1 BTU/lb∙°F 873.47 J/kg∙K 2.0876E-1 kcal/kg∙K
    8.8312E-1
    kJ/(kg.K)
    2.1107E-1 BTU/lb∙°F 883.12 J/kg∙K 2.1107E-1 kcal/kg∙K
  • Heat capacity at constant volume Cv
    6.6398E-1
    kJ/(kg.K)
    1.587E-1 BTU/lb∙°F 663.98 J/kg∙K 1.587E-1 kcal/kg∙K
    6.7959E-1
    kJ/(kg.K)
    1.6243E-1 BTU/lb∙°F 679.59 J/kg∙K 1.6243E-1 kcal/kg∙K
    6.8972E-1
    kJ/(kg.K)
    1.6485E-1 BTU/lb∙°F 689.72 J/kg∙K 1.6485E-1 kcal/kg∙K
  • Liquid (at boiling point)/gas equivalent
    622.28
    mol/mol
    657.21
    mol/mol
    680.44
    mol/mol
  • Solubility in water
    /
    5.948E-1
    mol/mol
    4.367E-1
    mol/mol
  • Specific gravity
    1.53
    1.53
    1.53
  • Specific volume
    5.057E-1
    m³/kg
    8.1005 ft³/lb
    5.341E-1
    m³/kg
    8.5555 ft³/lb
    5.53E-1
    m³/kg
    8.8582 ft³/lb
  • Thermal conductivity
    16.464
    mW/m∙K
    9.5191E-3 Btu/ft/h/°F 1.4166E-1 cal/hour∙cm∙°C 3.935E-5 cal/s∙cm∙°C 1.6464E-2 W/(m∙K)
    17.651
    mW/m∙K
    1.0205E-2 Btu/ft/h/°F 1.5187E-1 cal/hour∙cm∙°C 4.2187E-5 cal/s∙cm∙°C 1.7651E-2 W/(m∙K)
    18.445
    mW/m∙K
    1.0664E-2 Btu/ft/h/°F 1.587E-1 cal/hour∙cm∙°C 4.4085E-5 cal/s∙cm∙°C 1.8445E-2 W/(m∙K)
  • Vapor pressure
    32.1176
    bar
    3.2118E6 pa 465.8262 lbf/in2 31.6976 Atm 3211.76 Kpa 2.409E4 mmHg
    45.9221
    bar
    4.5922E6 pa 666.0435 lbf/in2 45.3216 Atm 4592.21 Kpa 3.4445E4 mmHg
    57.2912
    bar
    5.7291E6 pa 830.9383 lbf/in2 56.542 Atm 5729.12 Kpa 4.2972E4 mmHg
N2O
Nitrous 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

at 1.013 bar and boiling point

m3(Volume)
kg(Mass)
N2O
Nitrous oxide

Applications

Examples of uses of this molecule in Industry and Healthcare

Food

Nitrous oxide is used as gas propellant for aerosols packaging.

Food

Laboratories & Research Centers

Nitrous oxide is a combustive for the flame in atomic absorption spectrophotometry. It is used in calibration gas mixtures for petrochemical industry, environmental emission monitoring, industrial hygiene monitors and trace impurity analyzers.

Laboratories & Research Centers

Other

Nitrous oxide is a combustive for engine of scale models.

Pharma & Biotech

Nitrous oxide is used as gas propellant for aerosols packaging.

Pharma & Biotech

Electronic components

In semiconductor and display manufacturing, nitrous oxide can be the oxygen source for Chemical Vapor Deposition (CVD) of silicon oxynitride (doped or undoped) or silicon dioxide.

Electronic components
N2O
Nitrous oxide

Safety

Information to safely use this molecule

  • Major hazards
  • Material compatibility
  • GHS03
    Oxidising
  • GHS04
    Gas under pressure

Threshold of toxicity

  • VME
    /
  • VLE
    /
  • ILV-8h
    /
  • ILV 15mn
    /
  • TLV-TWA (USA)
    50
    ppm
    50 ppm 5.E-3 vol/% 5.E-5 vol/vol
  • TLV-STEL (USA)
    /

Odor

Sweet

Metals

  • Aluminium
    Satisfactory
  • Brass
    Satisfactory
  • Monel
    Satisfactory
  • Copper
    Satisfactory
  • Ferritic Steel
    Satisfactory
  • Stainless steel
    Satisfactory
  • Zinc
    Satisfactory
  • Titanium
    no data

Plastics

  • Polytetrafluoroethylene
    Satisfactory
  • Polychlorotrifluoroethylene
    Satisfactory
  • Polyvinylidene fluoride
    Satisfactory
    risk of explosion and fire
  • Polyvinyl chloride
    Satisfactory
  • Ethylene tetrafluoroethylene
    Satisfactory
  • Polycarbonate
    no data
  • Polyamide
    Satisfactory
    significant swelling, risk of explosion and fire
  • Polypropylene
    Satisfactory
    risk of explosion and fire

Elastomers

  • Buthyl (isobutene- isoprene) rubber
    Not recommended
    significant swelling, risk of explosion and fire
  • Nitrile rubber
    Not recommended
    significant swelling, risk of explosion and fire
  • Chloroprene
    Not recommended
    significant swelling, risk of explosion and fire
  • Chlorofluorocarbons
    Not recommended
    significant swelling
  • Silicon
    Satisfactory
  • Perfluoroelastomers
    no data
  • Fluoroelastomers
    Satisfactory
  • Nitrile rubber
    Satisfactory
  • Neoprene
    Satisfactory
  • Polyurethane
    Satisfactory
  • Ethylene-Propylene
    Not recommended
    significant swelling, risk of explosion and fire

Lubricants

  • Hydrocarbon based lubricant
    Not recommended
    risk of explosion and fire
  • Fluorocarbon based lubricant
    Satisfactory

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.

N2O
Nitrous oxide

Learn More

General information

More information

The gas was first synthesized by English natural philosopher and chemist Joseph Priestley in 1772, who called it "phlogisticated nitrous air". On Earth, it occurs naturally in soil and oceans. It is produced by the combustion of organic or fossils matters, particularly in industry. The massive use of nitrogen-based chemical fertilizers has contributed to increase the level of nitrous oxide found in soil. At normal temperature and pressure, nitrous oxide is a colorless, odorless gas. Dissolved in water, it tastes slightly sweet. Because of its chemical formula, it is a source of oxygen that may be useful in electronics, for depositions in the gaseous phase and as an oxidant to improve gas-fueled engines performance.