Which of the following is an example of a hazardous material?

Flammable liquids are classified as hazardous materials due to their ability to ignite and sustain combustion under specific conditions. These substances can pose significant risks to health and safety, especially in the context of transportation, storage, and use. They can lead to fires and explosions if not handled properly, which is why they are regulated and require specific safety protocols for management and response during incidents.

In contrast, water, sand, and wood do not typically exhibit hazardous characteristics under normal conditions. Water is essential for life and is generally considered non-hazardous, while sand and wood are generally inert and do not pose the same level of risk associated with flammable liquids, making them less of a concern in hazardous material classifications. Understanding the properties of these materials is crucial for recognizing and responding to potential hazards in various environments.