Answer:
The values shown in the table below are valid only for the conditions under which they were determined (usually room temperature and atmospheric pressure using a 2 inch tube with spark ignition). The flammability range of most materials expands as temperature, pressure and container diameter increase. All concentrations in percent by volume.
GasLELUELAcetone2.613Acetylene2.5100Acrylonitrile317Allene1.511.5Ammonia1528Benzene1.37.91.3 Butadiene212Butane1.88.4n Butanol1.7121 Butene1.610Cis 2 Butene1.79.7Trans 2 Butene1.79.7Butyl Acetate1.48Carbon Monoxide12.574Carbonyl Sulfide1229Chlorotrifluoro ethylene8.438.7Cumene0.96.5Cyanogen6.632Cyclohexane1.37.8Cyclopropane2.410.4Deuterium4.975Diborane0.888Dichlorosilane4.198.8Diethylbenzene0.8 1.1 Difluoro 1 Chloroethane914.81.1 Difluoroethane5.117.11.1 Difluoro ethylene5.521.3Dimethylamine2.814.4Dimethyl Ether3.4272.2 Dimethyl propane1.47.5Ethane312.4Ethanol3.319Ethyl Acetate2.211Ethyl Benzene16.7Ethyl Chloride3.815.4Ethylene2.736Ethylene Oxide3.6100Gasoline1.27.1Heptane1.16.7Hexane1.27.4Hydrogen475Hydrogen Cyanide5.640Hydrogen Sulfide444Isobutane1.88.4Isobutylene1.89.6Isopropanol2.2 Methane517Methanol6.736Methylac etylene1.711.7Methyl Bromide10153 Methyl 1 Butene1.59.1Methyl Cellosolve2.520Methyl Chloride717.4Methyl Ethyl Ketone1.910Methyl Mercaptan3.921.8Methyl Vinyl Ether2.639Monoethy lamine3.514Monomethy lamine4.920.7Nickel Carbonyl2 Pentane1.47.8Picoline1.4 Propane2.19.5Propylene2.411Propylene Oxide2.837Styrene1.1 Tetrafluoro ethylene443Tetrahydrofuran2 Toluene1.27.1Trichloro ethylene1240Trimethylamine212Turpentine0.7 Vinyl Acetate2.6 Vinyl Bromide914Vinyl Chloride422Vinyl Fluoride2.621.7Xylene1.16.6