marsh gas
Light carburetted hydrogen, CH4, found in coal-mines and about stagnant pools. (Cf. fire-damp.)
| 1848 Fownes Elem. Chem. 189 Marsh-gas. 1881 19th Cent. No. 48. 245 Light carburetted hydrogen, or marsh gas,..is the cause of explosions in collieries. |