Which term best defines the percentage of a flammable substance in air that will ignite when exposed to an ignition source?

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Multiple Choice

Which term best defines the percentage of a flammable substance in air that will ignite when exposed to an ignition source?

Explanation:
Flammable limits describe the range of fuel-air concentrations that can ignite when an ignition source is present. The best term for the percentage of a flammable substance in air that will ignite is the flammable (or explosive) limit. This range has two ends: the lower explosive limit is the minimum concentration that can ignite, and the upper explosive limit is the maximum concentration that can ignite. Autoignition temperature, by contrast, is the temperature at which ignition occurs without an ignition source, so it isn’t what this question is asking about.

Flammable limits describe the range of fuel-air concentrations that can ignite when an ignition source is present. The best term for the percentage of a flammable substance in air that will ignite is the flammable (or explosive) limit. This range has two ends: the lower explosive limit is the minimum concentration that can ignite, and the upper explosive limit is the maximum concentration that can ignite. Autoignition temperature, by contrast, is the temperature at which ignition occurs without an ignition source, so it isn’t what this question is asking about.

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