What class of fires includes items that can boil?

Class B fires involve flammable liquids and gases, which can include substances that are capable of boiling. This class covers materials such as gasoline, oil, and other flammable liquids that can emit vapors and ignite, especially when they are heated. The presence of a boiling liquid indicates that the substance can easily transition from a liquid to a gas, generating flammable vapors that can contribute to the fire's intensity and spread.

In contrast, Class A fires are typically associated with ordinary combustibles, such as wood, paper, and textiles, and do not directly involve combustible liquids or boiling substances. Class C fires relate to energized electrical equipment, while Class D fires involve combustible metals, which have different properties and behaviors compared to flammable liquids. Understanding the characteristics of Class B fires is crucial for effective response and firefighting strategies involving liquids that can boil and pose significant ignition risks.