Which of the following best defines a Class B fire?

A Class B fire is defined as one that involves flammable liquids and gases. This includes substances like gasoline, oils, paints, lacquers, and tar, which can ignite and spread rapidly. The characteristics of these materials make them volatile and susceptible to combustion, often producing intense flames and toxic fumes when burned.

This classification is essential for selecting the appropriate firefighting agents, as different classes of fires require different methods and materials to extinguish them effectively. For instance, using water on a Class B fire is ineffective and can even exacerbate the situation, as water can spread burning liquids. Instead, foam or dry chemical extinguishers are the preferred methods for tackling Class B fires because they can snuff out the flames and prevent re-ignition by creating a barrier between the fuel and the oxygen.

Understanding these fire classifications helps firefighters effectively manage fire incidents and ensures their safety as they employ the appropriate techniques and tools tailored to the specific type of fire.