Lower Explosion Limit LEL 3
Lower Explosion Limit LEL 3 : The LEL is expressed as a percentage of the total volume of the air-fuel mixture; it is the lowest concentration of vapor fuel in air under which spontaneous combustion will occur. An example is gasoline. A mixture containing 1.5% gasoline vapor in air (concentration of air being 98.5% in this mixture) will spontaneously combust. The LEL in this example is 1.5% or simply 1.5. Below this concentration, the mixture is described as being too "lean"; in the other words, there is insufficient fuel for spontaneous combustion to occur
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