alcohol briquette burnable butane carbon charcoal coal coal oil coke combustible dope electricity ethane ethanol fireball firing flammable flammable material fuel fuel additive fuel dope gas gas carbon gasoline heptane hexane illuminant illuminating gas inflammable inflammable material isooctane jet fuel kerosene light source luminant methane methanol natural gas octane oil paraffin peat pentane petrol petroleum propane propellant rocket fuel turf