IFSTA 7th Edition Chapter 18: Foam Fire Fighting, Liquid Fires, and Gas Fires Questions with Correct Answers

How does firefighting foam work? - ANSWER-By forming a blanket of foam on the surface of burning fuels - both liquid and solid What are the 4 methods that firefighting foam extinguishes and/or prevents ignition of fire? - ANSWER-Separating Cooling Smothering Penetrating Seperating - ANSWER-Creates a barrier between the fuel gases and possible ignition sources Smothering - ANSWER-Prevents air from reaching the fuel and mixing with the vapors and prevents the release of flammable vapors Penetrating - ANSWER-Lowers the surface tension of water and allows it to penetrate fires in class A materials Cooling - ANSWER-Lowers the temperature of the fuel and adjacent surfaces True/false: class A foam is intended for use in ordinary combustibles and flammable liquids, but class B foam is intended for use of flammable liquids only - ANSWER-False: Class A is intended for combustibles (class A fires) and Class B foam is intended for flammable liquids How does class A foam work? - ANSWER-By cooling and penetrating the fuel. It lowers surface tension of water allowing foam/water