Question
Explain the phenomenon of transfer of heat by means of convection.
Solution
i) Convection is the transfer of heat by the movement of a heated material.
ii) When the liquids or gases are heated, they expand and become lighter than colder liquids or gases surrounding them. Therefore, heated liquids or gases rise up, replacing the cooler liquids or gases.
iii) Then the cooler liquids or gases near the source of heat become warm and rise.
iv) This movement of heated liquids or gases away from a source of heat and the flow of cooler liquids or gases toward source of heat, transfers the heat.
This process is called convection.
v) During the convection process, the atoms or molecules of media themselves move from one end to the other to transfer heat.
ii) When the liquids or gases are heated, they expand and become lighter than colder liquids or gases surrounding them. Therefore, heated liquids or gases rise up, replacing the cooler liquids or gases.
iii) Then the cooler liquids or gases near the source of heat become warm and rise.
iv) This movement of heated liquids or gases away from a source of heat and the flow of cooler liquids or gases toward source of heat, transfers the heat.
This process is called convection.
v) During the convection process, the atoms or molecules of media themselves move from one end to the other to transfer heat.