What Is Thermal Conduction?

Thermal conduction is a heat transfer phenomenon when there is no macroscopic motion in the medium. It can occur in solids, liquids, and gases. However, strictly speaking, pure heat conduction is only in solids. Among them, natural convection also occurs due to the density difference caused by temperature gradients, so thermal convection and heat conduction occur simultaneously in the fluid.

The temperature difference within an object or system is a necessary condition for heat transfer. In other words, as long as there is a temperature difference in or between the media, heat transfer will definitely occur. The rate of heat conduction depends on the distribution of the temperature field in the object.

A way of heat transfer. Thermal conduction is the process by which a large number of molecules, atoms, or electrons collide with each other to transfer energy from the higher temperature part of the object to the lower temperature part. Is the main way of heat transfer in solids. In gas or liquid, the heat conduction process often happens simultaneously with convection. Conduction and convection are also one of the ways in which the human body dissipates heat. The blood circulation brings the heat from the body to the body surface, and the skin transfers heat to the air layer close to the skin (conduction heat dissipation). The heated air layer increases in temperature and decreases in density, so the flow rises. The surrounding cold air flows to the skin Fill up the flow of air (convection). Therefore, the human body's conduction and convection heat are always linked. ^[2]

There are many heat-conducting industries in the industry.

Various objects can transfer heat, but the thermal conductivity of different substances is different. Objects that are easy to transfer heat are called good conductors of heat, objects that are not easy to transfer heat are called bad conductors of heat, and metals are all good conductors of heat. Porcelain, wood and bamboo, leather, and water are all poor conductors. Among the metals, the best heat transfer is silver, followed by copper and aluminum. The least good at transferring heat are wool, feathers, fur, cotton, asbestos, cork and other fluffy substances. Asbestos is often used as a thermal insulator. Liquids, with the exception of mercury, are not good at transferring heat. Gases are less good at transferring heat than liquid. ^[5]