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

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.

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.