Which statement correctly describes the classification criteria for flammable versus combustible liquids?

Which statement correctly describes the classification criteria for flammable versus combustible liquids?

• A. Flammable liquids have flash points below 140F; Combustible liquids have flash points 140F or above.
• B. Flammable liquids have flash points above 200F; Combustible below 200F.
• C. Flammable liquids ignite at any temperature; Combustible liquids never ignite.
• D. Combustible liquids are nonflammable.

Answer: (A)

Classification is based on the liquid’s flash point—the lowest temperature at which its vapors can ignite in air in the presence of an ignition source. It’s important to note that this doesn’t mean the liquid will ignite at room temperature; it means vapors can reach an ignitable concentration if heated to that temperature. The threshold used here is 140°F: liquids with flash points below 140°F are flammable, while those with flash points at 140°F or higher are combustible. This distinction reflects how readily vapors are produced and can ignite under typical conditions. The other statements don’t fit because they either imply ignition at any temperature or claim that combustible liquids cannot ignite, which isn’t accurate.

Classification is based on the liquid’s flash point—the lowest temperature at which its vapors can ignite in air in the presence of an ignition source. It’s important to note that this doesn’t mean the liquid will ignite at room temperature; it means vapors can reach an ignitable concentration if heated to that temperature. The threshold used here is 140°F: liquids with flash points below 140°F are flammable, while those with flash points at 140°F or higher are combustible. This distinction reflects how readily vapors are produced and can ignite under typical conditions. The other statements don’t fit because they either imply ignition at any temperature or claim that combustible liquids cannot ignite, which isn’t accurate.