Chemical, physical and thermal properties of Methane - CH4 :
| Molecular Weight | 16.044 |
| Specific Gravity (gas related to air) | 0.554 |
| Specific Volume (ft3/lb, m3/kg) | 24.2, 1.51 |
| Density of liquid at atmospheric pressure (lb/ft3, kg/m3) | 26.3, 421 |
| Absolute Viscosity (lbm/ft s, centipoises) | 7.39 10-6, 0.011 |
| Sound velocity in gas (m/s) | 446 |
| Specific Heat - cp - (Btu/lboF or cal/goC, J/kgK) | 0.54, 2260 |
| Specific Heat Ratio - cp/cv | 1.31 |
| Gas constant - R - (ft lb/lboR, J/kgoC) | 96, 518 |
| Thermal Conductivity (Btu/hr ft oF, W/moC) | 0.02, 0.035 |
| Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - (oF, oC) | -259, -161.7 |
| Latent Heat of Evaporation at boiling point (Btu/lb, J/kg) | 219.2, 510000 |
| Freezing or Melting Point at 1 atm (oF, oC) | -296.6, -182.6 |
| Latent Heat of Fusion (Btu/lb, J/kg) | 14, 32600 |
| Critical Temperature (oF, oC) | -116, -82.3 |
| Critical Pressure (psia, MN/m2) | 673, 4.64 |
| Critical Volume (ft3/lb, m3/kg) | 0.099, 0.0062 |
| Flammable | yes |
| Heat of combustion (Btu/ft3, Btu/lb, kJ/kg) | 985, 2290, - |
- values at 25oC (77oF, 298 K) and atmospheric pressure
