The concentrations at which a vapor-to-fuel mixture in the air is capable of burning is referred to as the:

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The concentrations at which a vapor-to-fuel mixture in the air is capable of burning is referred to as the flammable range. The flammable range is the range or mixture of gas-to-air concentrations in which fire or explosion can occur if an ignition source is present. The lower flammable limit (LFL) and upper flammable limit (UFL) are the two limits of the flammable range.

The Concentrations at Which a Vapor-To-Fuel Mixture in the Air