Name one physical hazard that HAZMAT responders may encounter.

Explosive materials are indeed classified as a significant physical hazard that HAZMAT responders may encounter during their operations. These substances can undergo a rapid chemical reaction, producing gas and heat, and sometimes resulting in an explosion that poses serious risks to personnel and property nearby.

Understanding explosive materials is critical for HAZMAT teams, as they must be equipped with knowledge about the specific conditions that can trigger an explosion, such as heat, impact, or friction. Proper identification and assessment of explosive hazards allow responders to implement appropriate safety measures, such as establishing evacuation zones and using specialized equipment when approaching the incident.

While other options like corrosive materials, radioactive substances, and flammable liquids also represent physical hazards, explosive materials are notably hazardous due to the potential for sudden and violent reactions, demanding a strategic response to ensure safety for all involved.