Helium - ₂He: physical properties

Density properties

Density of solid: 214 kg m^‑3
Molar volume: 21.00 cm³

Elastic properties

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

Hardnesses

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

Heatscape representing the density of the elements — Heatscape picture representing the density of the periodic table elements.

Heatscape representing the molar volume of the elements — Heatscape representing the molar volume of the periodic table elements.

Electrical properties

Electrical resistivity: (no data) × 10^‑8 Ω m; or mΩ cm

Heat and conduction

Thermal conductivity: 0.1513 W m^‑1 K^‑1
Coefficient of linear thermal expansion: (no data) × 10^‑6 K^‑1

Optical properties

Reflectivity: (no data) %
$refractive index of the chemical elements displayed on a miniature periodic table$ Refractive index: 1.000035 (gas; liquid 1.028) (no units)

Acoustic properties

Velocity of sound: 970 m s^‑1