nkev, xim tsis muaj dab tsi, tsw ntxhiab, thiab tsis yog toxic, Consists mas methane thiab yog raug explosions li encountering taws hauv enclosed tej qhov chaw.
Raws li muaj tej yam tshwm sim, Yog hais tias tus concentration ntawm flammable gases nyob rau hauv ib cheeb tsam confined tshaj qhov tsawg tshaj plaws los ntawm ntau tshaj 10%, Nws yog tswv ib theem yus thiab nkag teb chaws yuav tsum tau pov tseg.