Class-A fire is to remove heat by spraying the burning solid fuels with water. Another control method would be to reduce the oxygen content in the immediate vicinity of the fire (i.e., "smother" the fire), such as by the introduction of an inert gas such as carbon dioxide. In a wildfire, fire control includes various wildland fire suppression techniques such as defensible space, widening the fuel ladder, and removing fuel in the fire's path with firebreaks and backfires to minimize the brush fire reaching new combustible fuel and spreading further. For a class A fire we use a Class A fire extinguisher to extinguish the fire. Class A fire extinguishers are used so one can smother the fire. The specific chemicals used are phosphate and monoammonium. Spray and sway from the base. Class-B fires Many Class B fires (hydrocarbons, petroleum, and similar fuels) cannot be efficiently controlled with water because fuels with a density less than water, such as gasoline or oil, float on water, resulting in the fire continuing to burn the fuel on top of the water. The configuration of some fuels, such as coal and baled waste paper, result in a deep seated and burrowing fire, resulting in less effective fire control by the application of water on the outer surfaces of the fuel. Class B fires should be extinguished with foam, powder, or carbon dioxide extinguishers. Some Class-B fires can be controlled with the application of chemical fire suppressants. Applying a combination of fire suppressant foam mixed with water is a common and effective method of forming a blanket on top of the liquid fuel, which eliminates the oxygen needed for combustion. Class-C fires Class-C fires involve electricity as a continuous power source for the ignition of the fuels associated with electrical equipment, such as plastic cable jackets. The application of water does not always result in effective fire control, and there is a general concern regarding conductivity and personnel safety, possibly resulting in electrical shock. Class C fires can be effectively controlled by removing the oxygen with a dry powder or carbon dioxide, dry chemical ABC extinguisher. The source of electricity also needs to be removed to eliminate re-ignition. Once the electricity is removed, the result is a Class A or B fire, where foam or dry chemical powder can be used to further control the fire. For electrical fires, one must always cut the