In relation to flammable liquids, what does LEL stand for?

LEL stands for Lower Explosive Limit, which is a critical concept in understanding the hazards associated with flammable liquids. The Lower Explosive Limit is the lowest concentration of a vapor in the air that can ignite and produce a flame when an ignition source is present. If the concentration is below this limit, the mixture is too lean to ignite; conversely, once the concentration exceeds the upper explosive limit (UEL), the mixture also cannot ignite.

Recognizing the LEL is essential for ensuring safety when handling flammable materials. Knowing that a substance has a specific LEL allows responders and safety personnel to assess risks and implement appropriate safety measures, such as ventilation or monitoring air quality in areas where flammable liquids are present.