Helium

Helium: physical properties

Temperatures

• Melting point: 0.95 [or -272.2 °C (-458 °F)] K
• Boiling point: 4.22 [or -268.93 °C (-452.07 °F)] K (liquid range: 3.27  K
• Critical temperature: 5.19 [or -267.96 °C (-450.33 °F)] K
• Superconduction temperature: no data  K

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Expansion and conduction properties

• Thermal conductivity: 0.1513  W m^-1 K^-1
• Coefficient of linear thermal expansion: no data  x 10^-6 K^-1

Bulk properties

• Density of solid: no data  kg m^-3
• Molar volume: 21.0  cm³
• Velocity of sound: 970  m s^-1

Elastic properties

• Youngs modulus: no data  GPa
• Rigidity modulus: no data  GPa
• Bulk modulus: no data  GPa
• Poissons 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

Electrical properties

• Electrical resistivity: no data  10^-8 Ω m; or mΩ cm

Optical properties

• Reflectivity: no data  %
• Refractive index: 1.000035 (gas; liquid 1.028) (no units)

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