# Molecular Weight: 28.01
# Boiling Point @ 1 atm: -320.5°F (-195.8°C, 77oK)
# Freezing Point @ 1 atm: -346.0°F (-210.0°C, 63oK)
# Critical Temperature: -232.5°F (-146.9°C)
# Critical Pressure: 492.3 psia (33.5 atm)
# Density, Liquid @ BP, 1 atm: 50.45 lb/scf
# Density, Gas @ 68°F (20°C), 1 atm: 0.0725 lb/scf
# Specific Gravity, Gas (air=1) @ 68°F (20°C), 1 atm: 0.967
# Specific Gravity, Liquid (water=1) @ 68°F (20°C), 1 atm: 0.808
# Specific Volume @ 68°F (20°C), 1 atm: 13.80 scf/lb
# Latent Heat of Vaporization: 2399 BTU/lb mole
# Expansion Ratio, Liquid to Gas, BP to 68°F (20°C): 1 to 694
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