Materials that burn in the presence of an ignition source are called _______.

Materials that burn in the presence of an ignition source are called _______.

• A. Gasoline
• B. Solids
• C. Chlorine
• D. Acetone

Answer: (B)

Flammable materials. The term describes substances that ignite readily when exposed to an ignition source such as a spark, flame, or hot surface. This property applies to materials in any state—solids, liquids, or gases—so the concept isn’t about being a solid. It’s about how easily the material catches fire, not its phase. Chlorine, for example, is not flammable, and while gasoline and acetone are flammable liquids, the general category that fits the blank is flammable materials.

Flammable materials. The term describes substances that ignite readily when exposed to an ignition source such as a spark, flame, or hot surface. This property applies to materials in any state—solids, liquids, or gases—so the concept isn’t about being a solid. It’s about how easily the material catches fire, not its phase. Chlorine, for example, is not flammable, and while gasoline and acetone are flammable liquids, the general category that fits the blank is flammable materials.