Thorium: physical properties
Mechanical properties
Density properties
Density of solid: 11724 kg m‑3
Molar volume: 19.80 cm3
Elastic properties
Young's modulus: 79 GPa
Rigidity modulus: 31 GPa
Bulk modulus: 54 GPa
Poisson's ratio: 0.27 (no units)
Hardnesses
Mineral hardness: 3.0 (no units)
Brinell hardness: 400 MN m-2
Vickers hardness: 350 MN m-2
Electrical properties
Electrical resistivity: 15 × 10‑8 Ω m; or mΩ cm
Heat and conduction
Thermal conductivity: 54 W m‑1 K‑1
Coefficient of linear thermal expansion: 11.0 × 10‑6 K‑1
Optical properties
Reflectivity: (no data) %
Refractive index: (no data) (no units)
Acoustic properties
Velocity of sound: 2490 m s‑1
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