What term is used to describe the range of gas or vapor concentrations that can ignite?

The term "flammable range" is used to describe the range of gas or vapor concentrations in air that can support combustion. This range is defined by the lower explosive limit (LEL) and the upper explosive limit (UEL). If the concentration of the gas or vapor falls within this range, it can ignite if an ignition source is present.

Understanding the flammable range is crucial for safety in environments where combustible gases are present, as it helps identify conditions that could lead to a fire or explosion. Operators must be aware of the specific flammable range of materials they handle to implement appropriate safety measures, such as ventilation or monitoring for gas leaks.

While the ignition point refers to the minimum temperature required to ignite a substance, it does not encompass the varying concentrations of gases. The explosion threshold is not a standard term used in this context, and hazard zone typically refers to areas where dangerous materials are handled but does not specifically indicate concentration ranges.