Properties of Ozone (O3)
Ozone is a molecule composed of three oxygen atoms, chemically represented as O3. It is a pale blue gas with a distinct, sharp odor. Ozone plays a vital role in Earth’s atmosphere, existing in two main layers: the ozone layer in the stratosphere and ground-level ozone in the troposphere.
The following table provides a comprehensive list of ozone 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 | 47.998 g/mol |
| Density (0°C) | 2.144 kg/m3 |
| Dynamic Viscosity (25°C) | 13.9 µPa·s |
| Thermal Properties | Metric |
| Melting Point | -192.5 °C |
| Boiling Point | -111.9 °C |
| Thermal Conductivity (25°C) | 0.018 W/m·K |
| Specific Heat Capacity (Cp) | 817 J/kg·K |
| Critical Constants | Metric |
| Critical Temperature (Tc) | -12.15 °C |
| Critical Pressure (Pc) | 5.57 MPa |
| Critical Density (ρc) | 539 kg/m3 |
| Electrical Properties | Metric |
| Relative Permittivity (εr) | 1.0017 |
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.