Encyclopedia
Mine gas
Mine gas (firedamp): a mixture of flammable gases or a flammable gas naturally occurring in mines
Source: "GOST R EN 1127-2-2009. Explosive atmospheres. Explosion protection and prevention of explosion. Part 2. Fundamental concept and methodology (for underground workings)"
(approved by Order of Rosstandart dated October 29, 2009 No. 489-ст)