Chemical symbol: He | Molecular weight: 4.003 |
Melting point: -272 ℃ (25.6bar) | Boiling point (101.325kpa) : -268.9 ℃ |
Liquid density (101.325 kpa, -269 ℃) : 124.8kg/m3 | Gas density (21.1 ℃, 101.325 kpa) : 0.1656 kg/m3 |
Critical temperature: -267.9 ℃ | Critical density: 69.64kg /m3 |
Critical pressure: 227 Kpa | Specific volume (21.1 ℃, 101.325Kpa) :6.039m3/kg |
Heat of vaporization (-268.9℃, 101.325 Kpa) : 20.4KJ/kg | Specific heat (21.1℃, 101.325 kpa) : Cp=5.19 KJ/(kg.c) |
CV=3.11KJ/(kg.c) | Specific heat ratio: Cp/Cv=1.667 |