What does AFFF stand for in foam systems?

AFFF stands for Aqueous Film Forming Foam. This type of foam is specifically designed for suppressing flammable liquid fires, such as those involving petroleum products. AFFF works by creating a thin film that spreads across the surface of the burning liquid, effectively smothering the flames and preventing the release of flammable vapors.

The foam's ability to form a film is crucial; it not only helps to extinguish the flames but also enhances the foam's ability to cool the fuel underneath, thus preventing re-ignition. AFFF is utilized in various firefighting applications, particularly at airports and industrial sites where flammable liquids are commonly stored or used.

While other options contain terms related to fire or foam, they do not accurately represent the widely recognized term specifically used in firefighting scenarios.