A poisonous gas. / (military) Any poisonous gas used as a chemical weapon.

coal gas, especially when used for domestic lighting

A pipe or hose connecting a gas appliance to the main supply of natural gas for the apartment, office or building.

plural of gas line

(colloquial) hydrogen sulfide

(physics) The part of fluid dynamics concerning gases

A kind of gas made by forcing air through a volatile hydrocarbon, such as the lighter petroleums. The air is so saturated with combustible vapour as to be a convenient illuminating and heating agent.

coal tar

A bituminous or hydrogenous coal yielding a high proportion of volatile material, and therefore available for the manufacture of illuminating gas.

A gasworks apparatus within which gas from the condenser is brought in contact with a falling stream of water, to precipitate the tar remaining in it.