Final answer:
AFFF is a type of fire extinguishing agent that is compatible with protein foam and dry chem. It is able to spread across the burning surface and extinguish fires of organic liquids. It is commonly used in fighting large-scale fires.
Step-by-step explanation:
Aqueous film-forming foam (AFFF), also known as light water, is a type of fire extinguishing agent that is compatible with protein foam and dry chem. AFFF is a fluorinated solution that is able to spread across the burning surface and extinguish the fire. It is commonly used to fight large-scale fires of organic liquids, such as flammable hydrocarbons.