Which statement correctly differentiates flammable liquids from combustible liquids in the given definitions?

Which statement correctly differentiates flammable liquids from combustible liquids in the given definitions?

• A. Flammable liquids have flash points above 200 degrees.
• B. Combustible liquids have flash points below 141 degrees.
• C. Flammable liquids have a flash point not more than 141 degrees Fahrenheit.
• D. All liquids with flash points above 200 degrees are considered flammable.

Answer: (C)

Understanding how flash point separates flammable from combustible liquids is key. The flash point is the lowest temperature at which a liquid’s vapors can ignite in air. When that point is at or below 141°F, the liquid is considered flammable because its vapors can reach ignition temperatures at relatively low ambient temperatures. If the flash point is higher than 141°F, the liquid requires more heat to produce ignitable vapors and is classified as combustible. So stating that flammable liquids have a flash point not more than 141°F aligns with this boundary. The other options misstate where the line lies or imply behavior (e.g., above 200°F) that would not fit the standard classification.

Understanding how flash point separates flammable from combustible liquids is key. The flash point is the lowest temperature at which a liquid’s vapors can ignite in air. When that point is at or below 141°F, the liquid is considered flammable because its vapors can reach ignition temperatures at relatively low ambient temperatures. If the flash point is higher than 141°F, the liquid requires more heat to produce ignitable vapors and is classified as combustible. So stating that flammable liquids have a flash point not more than 141°F aligns with this boundary. The other options misstate where the line lies or imply behavior (e.g., above 200°F) that would not fit the standard classification.