Final answer:
Aqueous solutions of fluorinated surfactants are developed as foam to fight fires involving polar solvents.
Step-by-step explanation:
The type of foam that was developed for use on polar solvents is aqueous solutions of fluorinated surfactants. In the 1960s, US Navy researchers developed these foams to fight large-scale fires of organic liquids by reducing the surface tension of water below that of the fuel, allowing the foam to spread across the burning surface and extinguish the fire. This type of foam is commonly used today to combat fires involving polar solvents.