The following are the lower explosive limits (LEL) of selected gases Acetone 2.5% vol Hexane 1.1% vol Acetylene 2.5% vol Hydrogen 4.0% vol Ammonia 15.0% vol Isopropyl Alcohol (Isopropanol) 2.0% vol Benzene 1.2% vol Methane 5.0% vol Butane 1.9% vol Methyl Alcohol...