In order to create an effective foam blanket, what characteristic is important for the pattern?

An effective foam blanket is crucial for extinguishing flammable liquid fires, as it serves to smother the fire and prevent re-ignition. The characteristic of needing to be dispersed is important because a dispersed foam pattern ensures that the foam spreads out evenly over the surface of the burning liquid. This dispersal allows the foam to effectively cover the fuel, suppressing vapors and cutting off the fire's access to oxygen.

A tightly concentrated or dense foam may not spread adequately across a larger surface area, which could lead to incomplete coverage and less effective fire suppression. Conversely, a foam that flows quickly might not maintain sufficient stability or coverage on the fuel surface, making it less effective at controlling the fire.

Thus, achieving a dispersed foam pattern is key in creating an effective foam blanket, as it maximizes contact with the flammable liquid and enhances the overall firefighting effectiveness.