coal gas

noun
1.
a gas used for illuminating and heating, produced by distilling bituminous coal and consisting chiefly of hydrogen, methane, and carbon monoxide.
2.
the gas formed by burning coal.

Origin:
1800–10

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World English Dictionary
coal gas
 
n
a mixture of gases produced by the distillation of bituminous coal and used for heating and lighting: consists mainly of hydrogen, methane, and carbon monoxide

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

coal gas

gaseous mixture-mainly hydrogen, methane, and carbon monoxide-formed by the destructive distillation (i.e., heating in the absence of air) of bituminous coal and used as a fuel. Sometimes steam is added to react with the hot coke, thus increasing the yield of gas. Coal tar and coke (qq.v.) are obtained as by-products.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
It is almost as invisible as a jet of coal gas or hydrogen is in air.
The coal gas is put back into service as a fuel, not only for the coke making but also for the iron and steel operations.
The samples will be tested in a bench-scale reactor using simulated coal gas compositions.
Operated mainly as a gasifier, the reactor vessel produces coal gas that is tested downstream.
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