Liquids with flash points less than 100 degrees F are classified as which?

• A. Nonflammable
• B. Highly volatile
• C. Combustible (Kerosene/veg oil)
• D. Flammable (Gasoline/acetone)

Answer: (D)

Flash point is the lowest temperature at which enough vapor is produced to form an ignitable mixture with air. If that point is under 100°F, the liquid’s vapors can ignite at room temperature or with only a small heat source, so it’s classified as flammable. Gasoline and acetone have very low flash points, so they’re labeled flammable. In contrast, liquids with flash points at or above 100°F are considered combustible, like kerosene or many vegetable oils, which need higher temperatures to ignite. Nonflammable and the “highly volatile” label don’t define this flammability category in the same way, so they don’t apply here.