Final answer:
AFFF stands for Aqueous Film Forming Foam, which is a type of firefighting foam that can protect fuels from re-ignition. The efficiency of AFFF in protecting fuels from re-ignition is measured in terms of the amount of burning fuel it can extinguish per gallon of AFFF solution.
Step-by-step explanation:
AFFF stands for Aqueous Film Forming Foam, which is a type of firefighting foam that contains water and a foaming agent called fluorosurfactant. This foam can spread across the surface of a burning fuel and create a protective barrier, preventing re-ignition. The efficiency of AFFF in protecting fuels from re-ignition is typically measured in terms of the amount of burning fuel it can extinguish per gallon of AFFF solution.
For example, if the efficiency is 4 gallons of burning fuel per gallon of AFFF solution, it means that each gallon of AFFF can extinguish 4 gallons of burning fuel.