what is the spread of fire by transfer of heat through metal pipes called

The spread of fire by transfer of heat through metal pipes is called conduction.

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When a fire heats a metal pipe, the metal (a good thermal conductor) carries heat along its length to other areas. If that heat reaches combustible materials (like wood, plastic, or insulation) at the far end, those materials can ignite, allowing the fire to spread without direct flames ever touching them.

In fire safety theory, this specific mode of spread—heat travelling through solid materials such as metal beams, pipes, or handrails—is referred to as conduction , distinct from convection (through moving fluids like hot air or smoke) and radiation (through electromagnetic waves/“heat through space”).

So, if a question asks “What is the spread of fire by transfer of heat through metal pipes called?”, the correct one-word answer is: conduction.

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