What does the acronym 'AFFF' stand for?

The acronym 'AFFF' stands for Aqueous Film-Forming Foam. This type of firefighting foam is particularly effective against flammable liquid fires, such as those involving petroleum products. AFFF creates a film that helps to smother the flames and prevent re-ignition by cutting off the oxygen supply to the fire, while also cooling the burning surface. Due to its unique properties, AFFF is widely used in various firefighting applications, especially in aviation and industrial settings where there is a high risk of flammable liquid fires.

The other choices do not accurately reflect what AFFF stands for or describe a recognized foam type used in firefighting.