Certified Fire Investigator Practice Exam

Which of the following best describes the term "Flammable"?

1. Incapable of burning

2. Capable of burning without a flame

3. Capable of burning with a flame

4. Resistant to ignition

The correct answer is: Capable of burning with a flame

The term "flammable" specifically refers to a substance's ability to ignite and sustain combustion, particularly in the presence of a flame. When a material is described as flammable, it indicates that it can easily catch fire and burn vigorously when exposed to an ignition source, such as an open flame or sufficiently high temperature. The key aspect of flammability is that it includes the capability to burn with a flame, which distinguishes it from other terms that might apply to materials that can combust under different conditions. This characteristic is critical for understanding fire hazard assessments and safety protocols in environments where such materials might be handled or stored. In contrast, the other options do not accurately convey the essence of flammability. For example, being incapable of burning or resistant to ignition suggests a lack of flammability entirely, while the notion of burning without a flame typically describes smoldering materials rather than active combustion that is characteristic of flammable substances. Therefore, the definition that aligns best with the concept of flammable is the ability to burn with a flame.