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

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

Answer: (B)

The key idea is how the flash point determines flammability risk. The flash point is the lowest temperature at which a liquid gives off enough vapor to form a flammable mixture with air. If that temperature is above about 100°F, the liquid won’t produce enough vapor to ignite at normal room temperatures, so it’s classified as combustible rather than flammable. Kerosene and many vegetable oils have flash points above 100°F, which is why they’re labeled combustible. In contrast, liquids with flash points below 100°F—like gasoline or acetone—ignite more easily at typical temperatures and are labeled flammable. Highly volatile isn’t the standard category based on this 100°F threshold, and nonflammable would imply no ignition risk under normal conditions, which isn’t the case here.