What does the term "flashback" refer to in a HAZMAT context?

In the context of HAZMAT operations, the term "flashback" specifically refers to a return of flame along a path to the source of flammable vapors or gas. This phenomenon can occur when flammable vapors from a material ignite and the flames follow the pathway of the vapor back to the source, which is often where the flammable material is stored or used. Understanding flashback is crucial for safety in hazardous material situations because it can lead to sudden and dangerous fire incidents if not properly managed. Awareness of this risk helps responders implement adequate safety measures to prevent ignition sources from coming into contact with flammable vapors, minimizing hazards during HAZMAT incidents.