Physical Properties Of HELIUM

# Molecular Symbol: He
# Molecular Weight: 4.003
# Boiling Point @ 1 atm: -452.1°F (-268.9°C, 4oK)
# Freezing Point @ 367 psia: -459.7°F (-272.2°C, 0oK)
# Critical Temperature: -450.3°F (-268.0°C)
# Critical Pressure 33.0 psia: (2.26 atm)
# Density, Liquid @ B.P., 1 atm: 7.798 lb./cu.ft.
# Density, Gas @ 32°F (0°C), 1 atm: 0.0103 lb./cu.ft.
# Specific Gravity, Gas (Air = 1) @ 32°F (0°C), 1 atm: 0.138
# Specific c Gravity, Liquid @ B.P., 1 atm: 0.125
# Specific c Volume @ 32°F (0°C), 1 atm: 89.77 cu.ft./lb.
# Specific c Volume @ 68°F (20°C), 1 atm: 96.67 cu.ft./lb.
# Latent Heat of Vaporization: 34.9 Btu/lb. mole
# Expansion Ratio, Liquid to Gas, B.P. to 32°F (0°C): 1 to 754