🔍 Key Concepts

• Fire classes on ships: Class A (ordinary combustibles), Class B (flammable liquids), Class C (electrical) • How foam extinguishers work: smothering by forming a blanket over the fuel surface • Differences between agents: water, foam, CO₂, and dry chemical and where each is normally used

💭 Think About

• Ask yourself: which class of fire involves burning liquids where cutting off the oxygen at the surface is most important? • Consider whether foam is safe on energized electrical equipment, and how that affects any answer choices that include Class C. • Think about whether foam is normally chosen for solid materials like wood and paper, or if there is a more common agent for those fires.

✅ Before You Answer

• Verify what Class B fires are defined as in standard fire classifications. • Double-check whether foam conducts electricity and what that implies for Class C fires. • Confirm which extinguishing agents are most commonly associated with Class A fires versus flammable liquid fires.