The statement that the flammable cloud is at or below the lower explosive limit (LEL) is true or false?

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Multiple Choice

The statement that the flammable cloud is at or below the lower explosive limit (LEL) is true or false?

Explanation:
The idea being tested is how the lower explosive limit defines when a vapor-air mix can ignite. The LEL is the minimum concentration of vapor in air that can burn; below that, the mixture is too lean to ignite. So a flammable cloud would only be ignitable if its concentration is between the LEL and the UEL. If the cloud is at or below the LEL, it cannot sustain combustion. Therefore the statement is false.

The idea being tested is how the lower explosive limit defines when a vapor-air mix can ignite. The LEL is the minimum concentration of vapor in air that can burn; below that, the mixture is too lean to ignite. So a flammable cloud would only be ignitable if its concentration is between the LEL and the UEL. If the cloud is at or below the LEL, it cannot sustain combustion. Therefore the statement is false.

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