What is the flammable range of un-diluted propane?

The flammable range of un-diluted propane is correctly identified as 2.15-9.6 percent. This range represents the concentration of propane in the air that is capable of igniting and burning if an ignition source is present. Understanding the flammable range is critical for fire investigation and safety, as it helps determine the conditions under which propane can pose a fire hazard.

The lower limit (2.15 percent) indicates the minimum concentration of propane needed to support combustion, while the upper limit (9.6 percent) signifies the concentration at which there is insufficient oxygen for combustion to occur effectively. This knowledge is essential for firefighters, investigators, and safety personnel to prevent and respond appropriately to potential fire hazards involving propane.