Properties of Nitrogen Dioxide (NO2)
Nitrogen dioxide (NO2) is a reddish-brown gas composed of nitrogen and oxygen molecules. It is a prominent air pollutant and a component of smog. Nitrogen dioxide is produced primarily from the combustion of fossil fuels in vehicles and industrial processes.
The following table provides a comprehensive list of nitrogen dioxide properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Molar Mass | 46.006 g/mol |
| Density (25°C) | 1.88 kg/m3 |
| Dynamic Viscosity (25°C) | 13.2 µPa·s |
| Thermal Properties | Metric |
| Melting Point | -11.2 °C |
| Boiling Point | 21.1 °C |
| Thermal Conductivity (25°C) | 0.167 W/m·K |
| Specific Heat Capacity (Cp) | 804 J/kg·K |
| Critical Constants | Metric |
| Critical Temperature (Tc) | 158 °C |
| Critical Pressure (Pc) | 10.13 MPa |
| Critical Density (ρc) | 557 kg/m3 |
| Hazardous Data | Metric |
| NFPA Rating (Health) | 3 |
| NFPA Rating (Fire) | 0 |
| NFPA Rating (Reactivity) | 0 |
Unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)
Related Pages
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017. 3) Yaws, Carl L. The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. Netherlands: Elsevier Science, 2015. 4) Fire Protection Guide to Hazardous Materials, 14th Edition. United States: National Fire Protection Association, 2010.