Question

Name and define the methods of heat transfer.

Answer 1

Answer:

The three types of heat transfer

Heat is transfered via solid material (conduction), liquids and gases (convection), and electromagnetical waves (radiation).

Answer 2

The three methods of transfer of heat are as follows :

• conduction
• convection
• radiation

★ Conduction : Conduction is the most significant method of transfer of heat in solids, in this method heat is transferred from one particle of the object to next and then to next and so on. Without the particles leaving their places. The particles just vibrate about their mean positions, and keep on passing heat energy to their next - in - next neighbours.

★ Convection : The molecules in liquid and gases are quite free to move this is unlike solids whose molecules are quite rigidly fixed. It is this ability of liquid molecules to move around that causes a liquid to get heated up. We call this method of heat transfer in liquid and gases as convection.

★ Radiation : The heat of the sun does not reach us either by conduction or convection method this is because there is mostly empty space between the sun and the earth. Conduction and convection both required a material medium for the transfer of heat. It follows then that there must be third method of heat transfer. We call this method of heat transfer as radiation.