Table 2: Explosive Limits and Ignition Temperatures of Common Gases
| Explosive limits (lower & upper, in %) | Ignition temperatures | |
|---|---|---|
| Natural gas | 4.7 & 15 | 482-632 °C |
| Propane | 2.15 & 9.6 | 493-604 °C |
| Butane | 1.9 & 8.5 | 482-538 °C |
| Acetylene | 2.5 & 81 | 305 °C |
| Hydrogen | 4 & 75 | 500 °C |
| Ammonia | 16 & 25 | 651 °C |
| Carbon monoxide | 12.5 & 74 | 609 °C |
| Ethylene | 3.4 & 10.8 | 490 °C |
Note: Atmosphere is air at 20 degrees Celsius.
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