Which statement accurately describes flammable liquids?

Which statement accurately describes flammable liquids?

• A. They have low flash points
• B. They have high flash points
• C. Vapor pressure is unrelated to flammability
• D. They cannot form vapors

Answer: (A)

Flammability is determined by the flash point—the lowest temperature at which a liquid can produce enough vapor to ignite in air. Flammable liquids have low flash points, meaning they can form ignitable vapors at relatively low temperatures and under everyday conditions. The other statements aren’t correct: a high flash point means the liquid is less flammable because it requires more heat to generate ignitable vapor; vapor pressure is related to flammability since higher vapor pressure means more vapor is present at a given temperature, increasing flammability risk; and liquids can and do form vapors, which is essential for ignition.

Flammability is determined by the flash point—the lowest temperature at which a liquid can produce enough vapor to ignite in air. Flammable liquids have low flash points, meaning they can form ignitable vapors at relatively low temperatures and under everyday conditions.

The other statements aren’t correct: a high flash point means the liquid is less flammable because it requires more heat to generate ignitable vapor; vapor pressure is related to flammability since higher vapor pressure means more vapor is present at a given temperature, increasing flammability risk; and liquids can and do form vapors, which is essential for ignition.