What is the approximate flash point of Diesel fuel?

What is the approximate flash point of Diesel fuel?

• A. 0-32 degrees
• B. 140-180 degrees
• C. -100 degrees
• D. 300 degrees

Answer: (B)

Flash point is the temperature at which a liquid’s vapors ignite in air, not the temperature at which the liquid itself catches fire. Diesel fuel consists of heavier hydrocarbon molecules, so it needs a higher temperature to produce enough vapors to ignite. Its typical flash point is about 125°F (52°C), which means it won’t flash at room temperature and sits in the higher end of the combustible-liquid range. Among the options, the closest approximate range is 140-180°F, making that choice the best fit. The other ranges are either too low for diesel’s vapor when heated or far too high for a typical diesel flash point.

Flash point is the temperature at which a liquid’s vapors ignite in air, not the temperature at which the liquid itself catches fire. Diesel fuel consists of heavier hydrocarbon molecules, so it needs a higher temperature to produce enough vapors to ignite. Its typical flash point is about 125°F (52°C), which means it won’t flash at room temperature and sits in the higher end of the combustible-liquid range. Among the options, the closest approximate range is 140-180°F, making that choice the best fit. The other ranges are either too low for diesel’s vapor when heated or far too high for a typical diesel flash point.