What is the range of an UEL?

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Multiple Choice

What is the range of an UEL?

The UEL is the highest concentration of fuel vapor in air that can still support combustion, and it’s measured as a percent by volume of fuel in air. For most fuels, this upper limit sits above five percent, meaning the flammable range extends to more than 5% fuel in air. That’s why the correct choice says more than 5 percent. The other ranges imply the UEL is at or below 5%, which doesn’t fit typical fuel–air mixtures where ignition can occur up to and beyond 5%.

The UEL is the highest concentration of fuel vapor in air that can still support combustion, and it’s measured as a percent by volume of fuel in air. For most fuels, this upper limit sits above five percent, meaning the flammable range extends to more than 5% fuel in air. That’s why the correct choice says more than 5 percent. The other ranges imply the UEL is at or below 5%, which doesn’t fit typical fuel–air mixtures where ignition can occur up to and beyond 5%.

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