If propane gas leaks in an enclosed space, what hazard may occur?

• A. Gas will dissipate quickly with no danger
• B. It is harmless in a well-ventilated room
• C. Gas can accumulate, creating a fire or explosion hazard
• D. It will immediately vanish when released

Answer: (C)

Propane leaks in enclosed spaces create a fire or explosion hazard because propane is heavier than air and tends to accumulate near the floor, pooling in corners or low spots. As the gas builds up, it can reach flammable concentrations. If an ignition source appears—sparks, flames, or hot surfaces—the accumulated gas can ignite or explode. Ventilation helps by diluting and removing the gas, but in a poorly ventilated area the danger remains. So the key idea is that gas can collect in an enclosed space and pose a serious fire or explosion risk.