Color: colorless
State at 25°C: gas
Density (g/cm3): 0.0009
Hardness (Mohs): No data
Melting Point (K): 24.53
Boiling Point (K): 27.1
Heat of Fusion (kJ/mol): 0.3
Heat of Vaporization (kJ/mol): 1.7
Heat of Atomization (kJ/mol): 0
Therm. Conductivity (J/m sec K): 0.05
Elec. Conductivity (1/mohm cm): 0
Abundance, Solar System: 6.537
Abundance, Earth's Crust: -2.3
Pure Cost ($/100g): $ 33.00
Bulk Cost ($/100g):  
Source: Air