Formula | H2 | CH4 | C8H18 | C8H20 |
Carbon content (mass%) | 0 | 75 | 84 | 86 |
Lower (net) heating value (MJ/kg) | 119.9 | 45.8 | 43.9 | 42.5 |
Density (at 1 bar & 273K; kg/m3) | 0.089 | 0.72 | 730–780 | 830 |
Volumetric energy content (at 1 bar & 273K; MJ/m3) | 10.7 | 33.0 | 33×103 | 35×103 |
Molecular weight [g/mol] | 2.016 | 16.043 | ~110 | ~170 |
Boiling point (K) | 20 | 111 | 298–488 | 453–633 |
Auto-ignition temperature (K) | 853 | 813 | ~623 | ~523 |
Minimum ignition energy (MJ) | 0.017 | 0.30 | 0.29 | - |
Stechiometric Air/FurlRatio (kg) | 34.3 | 17.2 | 14.6 | 14.5 |
Quenching distance (at 1 bar & 298 K at stoichiometry; mm) | 0.64 | 2.1 | ~2 | - |
Laminar flame speed in air (at 1 bar & 298 K at stoichiometry; m/s) | 1.85 | 0.38 | 0.37–0.43 | 0.37–0.43 |
Diffusion coefficient in air (at 1 bar & 273 K; m2/s) | 8.5×10−6 | 1.9×10−6 | - | - |
Combustible Range (%) | 4–75 | 5–15 | 1.3–7.1 | 0.6–5.5 |
Adiabatic flame temperature (at 1 bar & 298 K at stoichiometry; K) | 2480 | 2214 | 2580 | ~2300 |
Octane number (R+M)/2 | 130+ | 120+ | 86–94 | - |
Cetane number | - | - | 13–17 | 40–55 |