methane
gas gasPure methane (CH4) physical properties from the DESNZ 2025 'Fuel properties' sheet. DESNZ lists NO combustion CO2/CO2e factor for pure methane as a distinct row (it is a properties reference). No emission factor is attached here rather than reusing natural gas's (which is a grid mix, not pure CH4) — a combustion CO2 for methane is therefore 'not available' in v0.1 sources. IPCC has no separate methane row either; natural gas is the closest analog.
- Pure methane is treated numerically close to natural gas but is NOT identical to the UK grid mix. No combustion CO2/CO2e factor is available for pure methane in the v0.1 sources, so emissions show 'not available'.
Easily confused with
Different products with different numbers. Check you are on the right one.
- natural gas 0.802 kg/m³ 2.06672 kgCO₂e/m³
- CNG 175 kg/m³ 0.4507 kgCO₂e/L
- LNG 452.489 kg/m³ 1.17797 kgCO₂e/L
- biogas 1.15 kg/m³ 0.00124314 kgCO₂e/kg
Density
0.716 kg/m³
at gas phase; reference T/P NOT stated by DESNZ
Heating values
- 50 MJ/kg
- 55.406 MJ/kg
Emission factors
Not available. CO₂ and CO₂e factors are shown only when a cited source exists — never derived.
Worked example: 1 m³ methane converted to every unit
At a glance
- Energy · LHV 9.944 kWh source-based
- Mass 0.716 kg source-based
All results
Energy
Same energy expressed in other units.
Net calorific value · LHV/NCV
Gross calorific value · HHV/GCV
Mass
Volume
Energy density
Energy per unit of mass or volume.
Net calorific value · LHV/NCV
Emissions — context required
CO₂ and CO₂e are separate — never derived from each other.
Not available: methane has no emission factor in the data set. No value is invented.
Assumptions
- density: assumed methane density 0.716 kg/m³ at gas phase; reference T/P NOT stated by DESNZ
- heating value basis: energy on LHV/NCV basis, 50 MJ/kg
- heating value basis: energy on HHV/GCV basis, 55.406 MJ/kg
Sources
Follow each source back to its primary document — that traceability is the point. How conversions work →