Helium

Physical properties

Naming and classification
Physical properties
Reactions
Thermodynamic properties
Crystal structure
Atom properties
Electrochemical properties
Biological properties
Occurrence, isolation & synthesis
Isotopes
Safety
Uses
History
References

Physical state @ 20°C: Gas [2]
Color: Colorless [2]
Odor: Almost odorless [2]
Molecular weight (g/mol): 4.002602(2) [1]
Melting point (°C): List of melting points -272 [2]
Boiling point (°C): List of boiling points -268.93 [1]
Critical temperature (°C): 3He: -269.826 [4]
4He: -267.9486 [4]
Critical pressure (kPa): 3He: 116.4 [4]
4He: 227.5 [4]
Density (g/cm3): Density list Gas, 3He: 0.0001347 [4]
Gas, 4He: 0.00017850 [4]
Liquid, 3He: 0.589 [4]
Liquid, 4He: 0.1250 [4]
Critical, 3He: 0.000413 [4]
Critical, 4He: 0.0006964 [4]
Molar volume (cm3): 57 (Critical) [3]
Refractive index: 1.000035 (g)
1.028 (l)
Solubility: Water: 8.6 g/l (20 °C) [2]
Organic solvents: Insoluble (20 °C) [2]