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is delineated by the upper and lower flammability limits. Outside this range of air/vapor mixtures, the mixture cannot be ignited at that temperature and pressure. The LFL decreases with increasing temperature; thus, a mixture that is below its LFL at a given temperature may be ignitable if heated
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Chatelier, H. Notes sur le dosage du grisou par les limites d’inflammabilité. Ann. Mines 388–395 (1891).
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For liquids, the LFL is typically close to the saturated vapor concentration at the
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227:{\displaystyle LFL_{mix}={\frac {1}{\sum {\frac {x_{i}}{LFL_{i}}}}}}
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268:{\displaystyle LFL_{mix}}
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301:{\displaystyle LFL_{i}}
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