What does the Lower Explosive Limit (LEL) represent?

The Lower Explosive Limit (LEL) is a critical concept in understanding explosion hazards. It represents the lowest concentration of a flammable gas or vapor in air that can ignite and produce a flame upon exposure to an ignition source. When the concentration is below this limit, there is not enough fuel present in the air to support combustion, meaning that an explosion cannot occur.

This threshold is essential for safety in industries that handle flammable substances, as it helps determine safe operational limits and informs monitoring practices. Keeping concentrations above this limit without exceeding the Upper Explosive Limit (UEL) is vital for preventing potential explosions and ensuring workplace safety.