Definitions for "firedamp"
Keywords:  methane, coal, explosive, mines, gases
a mixture of gases (mostly methane) that forms in coal mines and becomes explosive when mixed with air. It is a source of serious hazard in coal mining operations.
A combustible gas, usually methane, occurring naturally in coal mines and form
The Miner's description for the naturally occurring 'marsh gas' (methane) which results from the decay of vegetable matter. In certain critical volumes, mixed with air, firedamp is highly explosive.