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Selected physical and chemical properties of hydrogen, methane and petrol.
| Properties | Hydrogen (H2) | Methane (CH4) | Petrol (− CH2 −) |
|---|---|---|---|
| Self-ignition temperature (°C) | 585 | 540 | 228-501 |
| Flame temperature (°C) | 2045 | 1975 | 2200 |
| Ignition limits in air (vol. %) | 4-75 | 5.3-15 | 1.0-7.6 |
| Minimal ignition energy (mW s) | 0.02 | 0.29 | 0.24 |
| Flame propagation in air (m/s) | 2.65 | 0.4 | 0.4 |
| Diffusion coefficient in air (cm2/s) | 0.61 | 0.16 | 0.05 |
