Above the LFL, vapor will often be capable of burning, but above the UFL, it will always burn. True or False?

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Prepare for the OSHA 501 Industry Trainer Test. Review with flashcards and multiple-choice questions, each with hints and explanations. Ace your exam!

Multiple Choice

Above the LFL, vapor will often be capable of burning, but above the UFL, it will always burn. True or False?

Explanation:
Flammability depends on the vapor concentration in air relative to the LFL and UFL. The mixture will ignite only when the vapor concentration is between these two limits. Below the lower limit the mixture is too lean to ignite, and above the upper limit it is too rich to support combustion. Within the flammable range, an ignition source can start a flame, but outside it (above the UFL) you cannot sustain burning. Therefore the statement is false.

Flammability depends on the vapor concentration in air relative to the LFL and UFL. The mixture will ignite only when the vapor concentration is between these two limits. Below the lower limit the mixture is too lean to ignite, and above the upper limit it is too rich to support combustion. Within the flammable range, an ignition source can start a flame, but outside it (above the UFL) you cannot sustain burning. Therefore the statement is false.

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