Identify one key characteristic of a Class B fire.

A Class B fire is specifically characterized by the presence of flammable liquids and gases. This category encompasses materials such as gasoline, oil, solvents, and propane, which can produce a significant fire hazard when ignited. These substances are often found in various environments, including industrial settings, garages, and kitchens, making it essential for firefighters to recognize the nature of Class B fires. Understanding the materials involved helps in selecting the appropriate firefighting methods and agents, such as foam or dry chemical extinguishers, specifically designed to combat fires fueled by these types of substances.

In contrast, other categories mentioned refer to different types of fires: flammable solids relate to Class A fires, combustion of metals points to Class D fires, and electrical equipment is associated with Class C fires. Each fire class requires tailored approaches to ensure effective suppression and safety.