Which range represents the lower explosive limit (LEL) in percent?

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Multiple Choice

Which range represents the lower explosive limit (LEL) in percent?

Explanation:
LEL marks the smallest fraction of fuel in air that can ignite. The explosive mixture exists between the LEL and the upper explosive limit, so ignition is not possible below the LEL and becomes possible once you reach that lower boundary. The range from 0% up to about 0.6% moisture of fuel in air represents that lower boundary, capturing the idea that concentrations below roughly 0.6% are too lean to ignite. The other ranges describe higher concentrations—either extending into the explosive region or above it—rather than the starting point of flammability.

LEL marks the smallest fraction of fuel in air that can ignite. The explosive mixture exists between the LEL and the upper explosive limit, so ignition is not possible below the LEL and becomes possible once you reach that lower boundary. The range from 0% up to about 0.6% moisture of fuel in air represents that lower boundary, capturing the idea that concentrations below roughly 0.6% are too lean to ignite. The other ranges describe higher concentrations—either extending into the explosive region or above it—rather than the starting point of flammability.

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