What is defined as flammable material?

Flammable material is specifically defined as any substance that has a flash point below 100 degrees Fahrenheit. The flash point is the lowest temperature at which vapors of a material can ignite in air when exposed to an open flame or spark. This characteristic is critical for understanding fire safety and handling procedures, particularly in environments where such materials are present.

The other choices do not accurately represent the definition of flammable materials. For instance, material that can explode on impact involves a different set of criteria related to its energetic properties and stability rather than its flammability. Similarly, non-toxic substances at all temperatures do not necessarily relate to flammability, as toxicity is a separate classification concerning health hazards. Lastly, the statement that any material that emits smoke is flammable is not precise; many materials can emit smoke without being flammable, depending on their composition and state. Therefore, understanding the specific temperature threshold of flammable materials, as indicated in the correct answer, is essential for safety and compliance in handling hazardous materials.