# Molecular Weight: 39.95
# Boiling Point @ 1 atm: -302.6°F (-185.9°C, 87oK)
# Freezing Point @ 1 atm: -308.8°F (-189.4°C, 85oK )
# Critical Temperature: -188.4°F (-122.4°C)
# Critical Pressure: 705.8 psia (48.0 atm)
# Density, Liquid @ BP, 1 atm: 87.40 lb/scf
# Density, Gas @ 68°F (20°C), 1 atm: 0.1034 lb/scf
# Specific Gravity, Gas (air=1) @ 68°F (20°C), 1 atm: 1.38
# Specific Gravity, Liquid (water=1) @ 68°F (20°C), 1 atm: 1.40
# Specific Volume @ 68°F (20°C), 1 atm: 9.67 scf/lb
# Latent Heat of Vaporization: 2804 BTU/lb mole
# Expansion Ratio, Liquid to Gas, BP to 68°F (20°C): 1 to 840
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