The term _____________ includes vapors from flammable or combustible liquids above their flash points.

• A. Combustible
• B. Flammable gas
• C. Pyrophoric
• D. Peroxide forming

Answer: (B)

In safety terms, flammability of vapors is about the gas-phase risk of ignition. Vapors produced by a liquid when temperatures rise above the liquid’s flash point exist as a gas and can mix with air to form an ignitable mixture. That gas-phase hazard is captured by the category “flammable gas.” So vapors from flammable or combustible liquids above their flash points fall under this term because they’re present as combustible gases able to propagate flame in air.

The other options describe different hazards that don’t apply here: a combustible liquid is a liquid with a higher flash point, not a gas-phase vapor hazard; pyrophoric substances ignite spontaneously in air, which is not about vapors from liquids above flash points; and peroxide-forming materials are about dangerous peroxides forming over time, not about gas-phase flammability.