🔍 Key Concepts

• Spontaneous combustion vs. ignition from open flame or spark • Role of heat build-up in confined, poorly ventilated spaces • Materials that oxidize and generate heat over time, especially when soaked with oil or solvents

💭 Think About

• Which option involves something that can slowly heat up by itself without a flame or spark, especially when piled or stored? • Which materials are known to react with oxygen in the air so that the temperature gradually rises in a confined area? • Which choices describe conditions where heat cannot easily escape, allowing temperature to keep increasing?

✅ Before You Answer

• Look for a material that is porous or absorbent and can soak up oil or solvent. • Check which option involves a confined or unventilated space, where heat can build up. • Eliminate options that are mainly a fire or explosion risk only when exposed to a flame, spark, or high external heat rather than heating up on their own.