Upper flammable limit refers to the percentage of vapor in the air above which there is insufficient air for a fire.

Name: Upper flammable limit refers to the percentage of vapor in the air above which there is insufficient air for a fire.
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The upper flammable limit (UFL) or upper explosive limit (UEL) is the maximum concentration of vapor in air above which propagation of flame does not occur on contact with a source of ignition because the mixture is too rich to sustain combustion.

Upper Flammable Limit Refers to the Percentage of Vapor in the Air