LOWER EXPLOSIVE LIMIT (LEL)
\lˈə͡ʊəɹ ɛksplˈə͡ʊsɪv lˈɪmɪt lˈɛl], \lˈəʊəɹ ɛksplˈəʊsɪv lˈɪmɪt lˈɛl], \l_ˈəʊ_ə_ɹ ɛ_k_s_p_l_ˈəʊ_s_ɪ_v l_ˈɪ_m_ɪ_t__ l_ˈɛ_l]\
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A measure of a gas or vapor in air, given an ignition source, such as arc, flame, or heat, capable of producing a flash of fire. Lowest concentration as a percentage versus normal air. Lower than LEL concentrations are ‘too lean’ to burn. Also known as lower flammable limit (LFL).
By Henry Campbell Black
