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1.6 PROCESS OF HEAT TRANSFER

Heat transfer is the movement of thermal energy from one thing to another thing of different
temperature. These objects could be two solids, a solid and a liquid or gas, or even within a liquid or

gas. The method of heat transfer are conduction, convection and radiation. Both conduction and
convection require matter to transfer heat.

Figure 1.11: Three methods of heat transfer

Conduction

Conduction is the heat transfer through one substance to another through direct contact.

Conduction occurs because molecules in a hotter region transfer energy to those of an adjacent

cooler region through collisions.

This method of heat transfer applied in a solid material which called conductor. Most metals are

good conductors because they easily transmit heat energy by conduction. Bad conductors are called

insulators because they do not easily transmit heat by conduction example wool, wood, most liquids

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