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Physical Properties for Methane

Methane
Formula CH4
Molecular Weight (lb/mol) 16.04
Critical Temp. (°F) -116.2
Critical Pressure (psia) 673.0
Boiling Point (°F) -258.7
Melting Point (°F) -296.5
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft3) (note 1)
Gas Density @ 70°F 1 atm (lb/ft3) 0.0416
Specific Volume @ 70°F 1 atm (ft3/lb) 24.06
Specific Gravity 0.565
Specific Heat @ 70°F (Btu/lbmol-°F) 8.53

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.


Gas Physical Properties

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