What is the lower explosive limit?

The lower explosive limit (LEL) refers to the minimum concentration of a vapor or gas in the air that is needed to create an ignitable mixture. When the concentration of the vapor is below this threshold, it will not ignite, even if there is an ignition source present. This concept is critical in understanding how hazardous materials behave in the environment, especially in fire and explosion prevention strategies.

In the context of hazardous materials and emergency response, recognizing the LEL helps responders assess the potential risks associated with a particular substance. It guides the approach to incidents involving flammable gases or vapors by determining safe distances and necessary precautions. Understanding this limit is crucial for effective incident management and ensuring the safety of emergency personnel and the public.