Home > General > What is Convection, Conduction and Radiation in Heat Transfer

What is Convection, Conduction and Radiation in Heat Transfer

Definition of Convection

Convection is a process of heat transfer by the actual movement of the heated matter. Consider a cup of water that is boiled. The warmer part of water that is close to the flame rises above and the cooler part of water moves downward. This movement is due to convection.

Definition of Conduction

Unlike convection, the process of conduction does not involve actual movement of the heated matter. In the process of conduction, energy is transferred from one particle of the matter to another. Consider a rod of metal heated from one end. With the passage of time, the heat will transfer along the length of the rod and read the other end. This is due to conduction.

Definition of Radiation

The process of radiation is totally different from convection and conduction as there is no involvement of heat transfer with or through matter. Radiation happens through rays. When a substance is heated or gains enough energy to emit electromagnetic rays, it transfers heat through radiation. Consider the energy of sun that reaches the surface of earth. There is no movement of matter, like it does in convection; neither, there is any energy transfer from particle to particle because there is vacuum in between the surfaces of sun and earth. Electromagnetic waves, who have the capacity to travel through vacuum, carry heat and reach the surface the earth, thus transferring heat through the process of radiation.

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