Describe the characteristics of Class B fires.

Class B fires are specifically characterized by the presence of flammable liquids and gases. This includes a wide range of substances, such as gasoline, oil, alcohol, grease, paints, and propane. The combustion of these materials typically produces flames and vapors that can spread quickly and pose significant hazards.

This distinction is crucial for fire safety training, as the methods for extinguishing Class B fires often differ from those used for other classes of fires. For example, water is ineffective against Class B fires and can even exacerbate the situation if the burning liquid is lighter than water. Instead, foam, dry chemical agents, and carbon dioxide are used to suppress the flames by cutting off the oxygen supply or preventing the flammable vapors from igniting.

The other classifications of fires mentioned in the options do not align with the characteristics of Class B fires. Class A fires involve solid combustibles, Class C fires pertain to electrical sources, and Class D fires focus on combustible metals. Understanding these distinctions helps individuals respond effectively to different types of fire incidents.