Which of the following is the best way to determine if a fuel source is too close to a heat source?

Determining if a fuel source is too close to a heat source requires a practical understanding of safety protocols and situational awareness. Using common sense involves an intuitive assessment based on the knowledge of materials, their flammable properties, and the heat sources nearby.

For example, considering the general guidelines and safety practices, flammable materials should usually be kept at a safe distance from heat sources to prevent accidental ignition. Common sense enables individuals to evaluate the physical layout of the environment and make decisions that prioritize safety. This includes recognizing that certain fuels should not be placed within a specified radius of an open flame or high-temperature equipment.

Other options may not necessarily promote immediate safety assessment in the same way. A thermometer, for instance, measures temperature but does not directly inform about the fuel source's safety in terms of proximity to heat. Consulting a professional is prudent but may not provide immediate actionable insights for on-site decisions. Visual inspection can reveal obvious hazards, yet it may not encompass the full range of safety considerations, including potential ignition risks. Thus, utilizing common sense offers an effective, immediate guideline for ensuring safety regarding fuel and heat source proximity.