coal gas

coal gas (uncountable)

1. (petrochemistry) The poisonous gas, used domestically for cooking etc and formerly for lighting, prepared by heating coal with steam (gasification); it is a mixture of hydrogen and carbon monoxide; sometimes synonymous with synthesis gas or town gas.

• (types of gas) coal gas, illuminating gas, natural gas, synthesis gas, town gas, water gas

• gaslight (noun), gasworks

• Coal gas on Wikipedia.Wikipedia

• gas coal