Combustion Values for some common Fuel Gases

Combustion values for some common fuel gases - natural gas, propane and butane - in Btu per cubic feet

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Combustion or heating values for some common fuel gases are indicated in the table below:

Fuel Gas	Combustion Value		Specific Gravity
Fuel Gas	(Btu/cubic feet) ¹⁾	(kJ/m³)	Specific Gravity
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

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