What is the LFL of carbon monoxide at ambient temperature in air?

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Multiple Choice

What is the LFL of carbon monoxide at ambient temperature in air?

Explanation:
LFL means the lowest concentration of a flammable gas in air that can ignite and sustain combustion if an ignition source is present. For carbon monoxide at room temperature, the flammable range in air runs from about 12.5% to roughly 74% by volume. So the lower limit, the LFL, is 12.5% by volume. That’s why 12.5 volume% is the correct choice. The other values (2.0%, 6.0%, 1.0%) are well below the ignition range, so mixtures at those concentrations wouldn’t ignite even with a spark.

LFL means the lowest concentration of a flammable gas in air that can ignite and sustain combustion if an ignition source is present. For carbon monoxide at room temperature, the flammable range in air runs from about 12.5% to roughly 74% by volume. So the lower limit, the LFL, is 12.5% by volume. That’s why 12.5 volume% is the correct choice. The other values (2.0%, 6.0%, 1.0%) are well below the ignition range, so mixtures at those concentrations wouldn’t ignite even with a spark.

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