Liquid-fuel tools could most likely start a fire when which condition occurs?

Liquid-fuel tools could most likely start a fire when which condition occurs?

• A. The tool is cooled with water
• B. The fuel is full
• C. Flammable fuel vapor comes into contact with the hot tool
• D. The tool is off

Answer: (C)

The key safety idea is that flammable vapors can ignite when they meet a heat source. Liquid-fuel tools have hot surfaces and exhaust that can heat fuel vapors to their ignition point. If those vapors escape and come into contact with that heat, a fire can start. Cooling the tool with water would reduce the surface temperature and make ignition less likely. Having the fuel tank full isn’t the immediate ignition trigger by itself, and turning the tool off removes the energy source, reducing the chance of ignition. So the dangerous moment is when flammable fuel vapor encounters the hot tool.

The key safety idea is that flammable vapors can ignite when they meet a heat source. Liquid-fuel tools have hot surfaces and exhaust that can heat fuel vapors to their ignition point. If those vapors escape and come into contact with that heat, a fire can start. Cooling the tool with water would reduce the surface temperature and make ignition less likely. Having the fuel tank full isn’t the immediate ignition trigger by itself, and turning the tool off removes the energy source, reducing the chance of ignition. So the dangerous moment is when flammable fuel vapor encounters the hot tool.