What is the minimum amount of gaseous fuel needed for a gas-air mixture to be flammable called?

The minimum amount of gaseous fuel required for a gas-air mixture to ignite and create a fire is referred to as the lower explosive limit (LEL). It represents the lowest concentration of the fuel in the air that can support combustion. If the concentration of the fuel is below this limit, the mixture will be too lean to burn.

Understanding the lower explosive limit is crucial for fire fighters and hazardous materials responders as it helps them assess the potential risk of combustion in environments where flammable gases may be present. This knowledge allows for better safety measures and tactics when dealing with hazardous materials or gas leaks, ensuring that responders can safely manage the situation and mitigate fire risks.