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Ways Of Transmitting Heat: Conduction, Convection And Radiation

1570 words - 6 pages

Conduction, convection and radiation are the three methods through which heat can be transferred from one place to another. The (www.hyperphysics.com) first method is the conduction through which heat can be transferred from one object to another object. This process is defined as the heat is transmitted from one to another by the interaction of the atoms and the molecules. The atoms and the molecules of the body are physically attached to each other and one part of the body is at higher temperature to the other part or the body, the heat begins to transfer. A simple experiment through which conduction can be understood easily is as follows. First of all, take a metallic rod of any length. Hold the rod in the hand or at any stand made up of the insulator so that the heat does not transfer to the stand. Heat up the one end of the rod with the help of the spirit lamp. After sometime, touch the other end of the end, the other end of the becomes heated too and the temperature of the other end of the rod has also increased. Although only one end of the rod is heated with the spirit lamp, but the other end of the rod has also been heated. This is represents that the heat has been transferred from one end of the rod to the other end of the rod without heating it from the other end. So, the transformation of the heat is taking place. This process is called the conduction. Conduction is a process which is lead by the free electrons. As the conduction happens occurs only in the metallic materials, the reason for it is that the metals has the free electrons and they can move freely from one part of the body to another part of the body. These electrons are not bounded by the nucleus so, they can move easily. And when the temperature of the body is increased by heating, the energy possessed by the electrons increases a lot. When the energy of these electrons increases, they begin to move with the greater speed as the velocity of the electrons increases due to the increase in the kinetic energy. Due to their random motion, these electrons interact with the neighboring molecules and transfer its energy to the other molecule. Similarly, the other free electrons collide with the other molecules imparting their energies to the other molecules. As a result, the temperature of the other molecule is also increased and in this way the heat is transferred from part of the body to the other part of the body through the process of the conduction. Moreover, as the conduction occurs only in the solids and the molecules of the solids possess the vibratory motion, so when they vibrate, they collide with the nearby atom thus transferring energy to them. hence it is proved that the heat can be transferred from one part of the body to the other part by a process called conduction. The process of conduction is also used in our daily lives. As we all know, metals are the good conductors of heat while the non metals are the bad conductors of heat. This is the main reason that...

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