What does LEL stand for in the context of explosive limits?

In the context of explosive limits, LEL stands for Lower Explosion Limit. This term refers to the lowest concentration of a gas or vapor in air that can ignite and cause an explosion when exposed to an ignition source. It is a critical safety measure in various industries, particularly those dealing with flammable materials, as it helps determine the minimum amount of a substance that must be present in the atmosphere for a potential explosive situation to occur.

Understanding LEL is essential for ensuring proper safety protocols and preventing hazardous situations in environments where flammable gases are present. Monitoring the concentration of these gases helps maintain them below the LEL threshold to minimize the risk of explosion. The other choices refer to different concepts that are not related to explosive limits, which is why they do not apply in this context.