Boron: physical properties

Mechanical properties

Density properties

• Density of solid: 2460 kg m^‑3
• Molar volume: 4.39 cm³

Elastic properties

• Young's modulus: (no data) GPa
• Rigidity modulus: (no data) GPa
• Bulk modulus: 320 GPa
• Poisson's ratio: (no data) (no units)

Hardnesses

• Mineral hardness: 9.3 (no units)
• Brinell hardness: (no data) MN m^-2
• Vickers hardness: 49000 MN m^-2

Electrical properties

• Electrical resistivity: > 10¹² × 10^‑8 Ω m; or mΩ cm

Heat and conduction

• Thermal conductivity: 27 W m^‑1 K^‑1
• Coefficient of linear thermal expansion: 6 × 10^‑6 K^‑1

Optical properties

• Reflectivity: (no data) %
• Refractive index: (no data) (no units)

Acoustic properties

• Velocity of sound: 16200 m s^‑1

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