Which statement about acetone's flammability is correct?

Acetone is classified as a highly flammable liquid, which means that it can easily ignite and sustain combustion when exposed to an open flame or spark. This flammability is due not only to its liquid state but also to the presence of vapors that are generated even at relatively low temperatures. In fact, acetone has a flash point of approximately 20°C (68°F), indicating that the vapors can ignite in the presence of an ignition source at common ambient temperatures.

The statement that acetone is flammable in both liquid and vapor forms is accurate because while the liquid itself can catch fire, it is the vapors that pose a significant risk for combustion, as they can spread quickly and are often more volatile than the liquid.

Understanding the properties of acetone is critical for safe handling and emergency response scenarios, emphasizing the need for proper storage and use in well-ventilated areas to mitigate fire risks.