# Molecular Weight: 2.016
# Boiling Point @ 1 atm: -423.0°F (-252.8°C, 20oK)
# Freezing Point @ 1 atm: -434.5°F (-259.2°C, 14oK)
# Critical Temperature: -399.8°F (-239.9°C)
# Critical Pressure: 188 psia (12.9 atm)
# Density, Liquid @ B.P., 1 atm: 4.23 lb./cu.ft.
# Density, Gas @ 68°F (20°C), 1 atm: 0.005229 lb./cu.ft.
# Specific Gravity, Gas (Air = 1) @ 68°F (20°C), 1 atm: 0.0696
# Specific Gravity, Liquid @ B.P., 1 atm: 0.0710
# Specific Volume @ 68°F (20°C), 1 atm: 192 cu. ft./lb.
# Latent Heat of Vaporization: 389 Btu/lb. mole
# Flammable Limits @ 1 atm in air 4.00%: -74.2% (by Volume)
# Flammable Limits @ 1 atm in oxygen 4.65%: -93.9% (by Volume)
# Detonable Limits @ 1 atm in air 18.2%: -58.9% (by Volume)
# Detonable Limits @ 1 atm in oxygen 15%: -90% (by Volume)
# Autoignition Temperature @ 1 atm: 1060°F (571°C)
# Expansion Ratio, Liquid to Gas, B.P. to 68°F (20°C): 1 to 848
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