A Class B fire is best defined as involving which substances?

A Class B fire is best defined as involving which substances?

• A. Water and foam
• B. Live electrical equipment
• C. Gasoline, oils, paint, lacquer, and tar
• D. Wood and paper

Answer: (C)

Fires fueled by liquids that can ignite and produce vapors at relatively low temperatures are driven by flammable liquids. Gasoline, oils, paint, lacquer, and tar are classic examples of such fuels, because they release vapors that burn readily and can spread the fire as the liquid continues to vaporize or pool. That makes these substances the best fit for this fire classification. In contrast, water and foam are suppression tools (not fuels for the fire), live electrical equipment points to a different fire type involving energized circuits, and wood and paper are solid combustibles that burn as ordinary materials, not as liquids. So the group listed here—gasoline, oils, paint, lacquer, and tar—best defines the substances that create this fire class.

Fires fueled by liquids that can ignite and produce vapors at relatively low temperatures are driven by flammable liquids. Gasoline, oils, paint, lacquer, and tar are classic examples of such fuels, because they release vapors that burn readily and can spread the fire as the liquid continues to vaporize or pool. That makes these substances the best fit for this fire classification. In contrast, water and foam are suppression tools (not fuels for the fire), live electrical equipment points to a different fire type involving energized circuits, and wood and paper are solid combustibles that burn as ordinary materials, not as liquids. So the group listed here—gasoline, oils, paint, lacquer, and tar—best defines the substances that create this fire class.