What is the lower flammability limit of propane in air?

The lower flammability limit (LFL) of propane in air is 2.15%. This value indicates the minimum concentration of propane vapor in air needed to support combustion. Below this concentration, the mixture is too "lean" to ignite. Understanding the LFL is crucial for ensuring safety when handling, storing, and dispensing LP-gas, as it provides critical information for risk assessments and emergency response planning. Knowledge of the LFL helps to prevent accidental ignition and potential hazards in environments where propane is used or stored.