Question

What does conduction heat mean?

Answer 1

Heat transfer:

1. The transfers of heat energy always take place from a body at a higher temperature to a body at a lower temperature. i.e. from the hot end to the cold end. TThe transfer of energy can take place by one of the following modes:
   1. Conduction,
   2. Convection and
   3. Radiation.

Conduction

1. The phenomenon of the transfer of heat energy from one part of a solid to another part at lower a temperature, without actual motion of the molecules is called conduction of heat or thermal conduction.
2. Medium is necessary for conduction. Particles of medium i.e., in solids, molecules of solid oscillate fast about their mean position and transfer heat energy but they do not leave their mean position.
3. It is a slow process.
4. The temperature of the medium increases through which heat flows i.e. a solid metal bar being a medium for the conduction of heat and it becomes hot.
5. In metallic solids, free electrons carry the heat energy hence they are good conductors of heat. Copper, Silver, Aluminum, etc. are good conductors.
6. In non-metallic solids and fluids, conduction takes place only due to vibrations of molecules, therefore they are poor conductors. Wood and glass are poor conductors of heat.