A gas produced by high-temperature distillation of bituminous coal. With a Btu value of about 680 Btu per cu ft, coal gas was used as a preheating medium in some flame cutting applications before natural gas became generally available.
A gas produced by high-temperature distillation of bituminous coal. With a Btu value of about 680 Btu per cu ft, coal gas was used as a preheating medium in some flame cutting applications before natural gas became generally available.