The suspension of droplets system in specific air space, containing more flammable mass than vapor and more flammable volume than liquid
Reference: Chemical Process Safety – Fundamentals with Applications, 2nd Ed., Daniel A. Crowl/Joseph F. Louvar
Aerosols are formed by diffusion of gases and liquids in air.
Reference: S2S (safety to safety website: Sharma 1992)
Science/Flammability/Flammability and Physical States