| | Firedamp -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-09) |
 | | Firedamp is a flammable gas found in (A mine where coal is dug from the ground) coal mines. |
| | Firedamp is explosive at concentrations between 4% and 16%, with most violence at around 10%, and caused much loss of life in coal mines before the invention of the (An oil lamp that will not ignite flammable gases (methane)) Davy lamp. |
| | Even after the safety lamps were brought into common use, firedamp explosions could still occur from sparks produced when coal contaminated with (Any of various metallic-looking sulfides (of which pyrite is the commonest)) pyrites was struck with metal tools. |
| www.absoluteastronomy.com /encyclopedia/f/fi/firedamp.htm (290 words) |
