Properties of Osmium (Os)
Osmium is a chemical element with the symbol (Os) and atomic number 76. It belongs to the platinum group of metals and is known for its high density, making it one of the densest naturally occurring elements. Osmium is typically found in platinum ores and is often alloyed with other metals, such as platinum and iridium.
The following table provides a comprehensive list of osmium (Os) 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 |
|---|---|
| Crystal Structure | Hexagonal close-packed (hcp) |
| Atomic Number | 76 |
| Molar Mass | 190.23 g/mol |
| Density | 22590 kg/m3 |
| Mechanical Properties | Metric |
| Young’s Modulus (E) | 558.6 GPa |
| Shear Modulus (G) | 223 GPa |
| Bulk Modulus (K) | 383 GPa |
| Poisson’s Ratio (ν) | 0.25 |
| Mohs Hardness | 7 |
| Thermal Properties | Metric |
| Melting Point | 3033 °C |
| Boiling Point | 5010 °C |
| Thermal Conductivity (27°C) | 87.6 W/m·K |
| Specific Heat Capacity (Cp) (25°C) | 130 J/kg·K |
| Coefficient of Thermal Expansion (αL) (25°C) | 5.1×10-6 1/°C |
| Electrical Properties | Metric |
| Electrical Resistivity | 8.12×10-6 Ω·cm |
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) A.M. Howatson, P.G. Lun, J.D. Todd, P.D. Engineering Tables and Data. United Kingdom: University of Oxford, Department of Engineering Science, 2009.