Here's what it means:
* Explosive Limit: This refers to the range of concentrations of a flammable substance in air where it can ignite and explode.
* Lower Explosive Limit (LEL): This is the minimum concentration of a flammable substance in air that will support combustion. Below this concentration, there isn't enough fuel present to sustain a fire or explosion.
In simpler terms:
* Imagine a flammable substance like methane gas.
* If there's too little methane in the air, it won't burn.
* If there's just the right amount (within the LEL), a spark could cause an explosion.
* If there's too much methane, the mixture will be too rich to burn.
LEL is an important safety measure:
* Industries that handle flammable substances use LEL monitoring to ensure safe working environments.
* It helps prevent fires and explosions by ensuring concentrations of flammable substances stay below the LEL.
Let me know if you have any other questions!