What is the flammable range of propane?

The flammable range of propane is accurately represented by the range of 2.1% to 9.5%. This range indicates the concentration of propane in air that can ignite and support combustion. When the concentration is below 2.1%, the mixture is too lean to ignite; conversely, if it exceeds 9.5%, it becomes too rich for combustion to occur. This specific range is crucial for safety and handling of propane in various applications, including storage, transport, and use in appliances. Understanding the flammable range helps prevent accidents and informs proper ventilation requirements in areas where propane is being used.