What type of physical hazard is recognized as a flammable substance?

A flammable substance is specifically recognized as a material that can easily ignite and burn in the presence of an ignition source. Flammable substances are characterized by having a flash point below a certain temperature, typically 100 degrees Fahrenheit (37.8 degrees Celsius) for liquids, which means they can release vapors that form ignitable mixtures with air.

The classification of flammable materials is critical in the context of hazardous waste operations, as it affects how these materials are handled, stored, and disposed of to minimize risks related to fire hazards. Understanding the properties of flammable substances helps in implementing appropriate safety measures and emergency response strategies.

While organic peroxides and oxidizers can also pose significant hazards, including the potential for combustion, they are classified based on different characteristics and reactions. Compressed gases may also represent a physical hazard but are not inherently flammable like the flammable category demands. Thus, choosing flammable as the correct answer accurately identifies the specific type of physical hazard represented.