The spread of fire through metal pipes by transferring heat is called conduction. Reasoning
- Conduction is heat transfer through solids, where heat moves via molecular interactions and electron diffusion within the material itself. Metal pipes, being good conductors, can transfer heat from one area to another, potentially igniting combustible materials connected along the pipe or nearby if they reach ignition temperatures. This mechanism is distinct from convection (heat transfer through fluids or gases) and radiation (heat transfer via electromagnetic waves).
 
