How does the flammable range affect a substance's potential for combustion?

The flammable range, often referred to as the explosive limits or flammability limits, is crucial in understanding a substance's potential for combustion because it establishes the specific concentration levels of a fuel and an oxidizer in the air necessary for ignition to occur. This range defines the lower and upper limits of concentration; concentrations below the lower limit are too lean to ignite, while those above the upper limit are too rich to sustain combustion.

When within this range, the fuel and oxygen can combine in a manner conducive to combustion, leading to a fire or explosion if an ignition source is present. Therefore, knowledge of the flammable range is essential for fire safety and prevention, as it directly impacts how and when combustion can happen. Understanding this concept allows firefighters and safety professionals to assess risks and develop appropriate strategies for handling combustible materials.