Final answer:
Foam is used to fight fires of hydrocarbon fuels like gas, diesel, and jet fuel. Fluorinated foam is effective in extinguishing these fires by separating the fuel from the oxygen.
Step-by-step explanation:
Foam is used for fighting large-scale fires of hydrocarbon fuels such as gas, diesel, and jet fuel. This type of foam is called fluorinated foam and it works by spreading across the burning surface and extinguishing the fire. Fluorinated foams are effective because they can separate the fuel from the oxygen, which helps to put out the fire.