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Engineering ToolBox > Combustion Values for some common Fuel Gases
Combustion or heating values for some common fuel gases are indicated in the table below:
| Fuel Gas | Combustion Value | Specific Gravity | |
| (Btu/cubic feet) 1) | (kJ/m3) | ||
| Blast Furnace | 92 | 3,400 | 1.02 |
| Butane | 3,184 | 118,600 | 2 (more heavy than air) |
| Coke oven | 570 | 21,200 | 0.40 |
| Manufactured Gas | 500 - 600 | 18,600 - 22,300 | |
| Natural Gas | 950 - 1,150 | 35,000 - 42,800 | 0.660 - 0.708 (more light than air) |
| Propane | 2,504 | 93,300 | 1.77 (more heavy than air) |
| Propane-Butane Mix | 2,500 - 3,200 | 93,000 - 119,000 | |
| Produces Bituminous | 163 | 6,000 | 0.86 |
1) 1 Btu/ft3 = 8.9 kcal/m3 = 3.73x104 J/m3