🔍 Key Concepts

• Three methods of heat transfer: conduction, convection, and radiation • How radiation behaves differently from heated gases or burning liquids • The meaning of unobstructed space in fire behavior

💭 Think About

• Look at each option and match it to conduction, convection, or radiation— which one actually describes radiation? • Ask yourself: does radiation need a solid material, moving gas, or can it work across empty space without anything in between? • Which choice mentions a situation where heat can move even if there is no physical contact or flow between spaces?

✅ Before You Answer

• Identify which answer choice clearly involves no physical contact or flow of material between the fire and the object being heated • Confirm that the chosen option does not depend on metal, liquids, or moving gases to transfer heat • Ensure the option fits the idea that radiation can travel in straight lines across open space from the fire to another object