Question

The resulting foam from an aqueous film forming foam (AFFF) extinguisher will ___ fuels lighter than air.

A. mix in with
B. float on the surface of
C. sink below the surface of
D. cause a chemical reaction with

Answer 1

The foam from an AFFF extinguisher will float on the surface of fuels lighter than air.

Step-by-step explanation:

The resulting foam from an aqueous film forming foam (AFFF) extinguisher will float on the surface of fuels lighter than air. AFFF is an aqueous solution of fluorinated surfactants which reduce the surface tension of water below that of fuel. This allows the foam to spread across the burning surface and extinguish the fire.