Physical Properties Of METHANE

Physical State at 15° C and 1 atm: Gas
Molecular Weight: 16.04
Boiling Point at 1 atm: –258.7°F = –161.5°C = 111.7°K
Freezing Point: –296.5°F = –182.5°C = 90.7°K
Critical Temperature: –116.5°F = –82.5°C = 190.7°K
Critical Pressure: 668 psia = 45.44 atm = 4.60 MN/m2
Specific Gravity: 0.422 at –160°C (liquid)
Liquid Surface Tension: 14 dynes/cm = 0.014 N/m at –161°C
Liquid Water Interfacial Tension: (est.) 50 dynes/cm = 0.050 N/m at –161°C
Vapor (Gas) Specific Gravity: 0.55 1.0
Ratio of Specific Heats of Vapor (Gas) : 1.306
Latent Heat of Vaporization: 219.4 Btu/lb = 121.9 cal/g = 5.100 X 105 J/kg
Heat of Combustion: –21,517 Btu/lb = –11,954 cal/g = –500.2 X 105 J/kg
Heat of Decomposition: Not pertinent
Heat of Solution: Not pertinent
Heat of Polymerization: Not pertinent
Heat of Fusion: 13.96 cal/g
Limiting Value: Currently not available
Reid Vapor Pressure: Very high