![]() ![]() Some holesĪre drilled on this rod to insert thermometers (say T 1, T 2, The temperatureĭifference between the ends can be obtained by keeping the ends in thermalĬontact with large reservoirs having temperature differences. Its two ends maintained at different temperatures. Metallic bar AB of length L and uniform cross-sectional area A with In a material for a given temperature difference. For conduction, there must be a material contact between the two bodies.Ĭoncept of Steady-State and Temperature Gradient:Ĭonduction may be described quantitatively as the time rate of heat flow.In this type of heat transfer, there is no actual migration of the medium particles from one point to another.In winter, the metal lock feels colder than the wooden door on touch.Nowadays cooking vessels are made with copper bottoms.Mountaineers use sleeping bags in polar regions.Tea-cups, Teapots, coffee jugs are made of porcelain.Cooking vessels have plastic handles because plastic a bad conductor of heat it does not allow the heat to pass through from hot vessel to hands and thus danger of burning can be avoided.Metals are used for making utensils because the metals are good conductors of heat they allow heat to pass through them easily. ![]() Wood, rubber, Plastic, paper, glass, air, ebonite , bakelite. Bad conductors of heat are also called as insulators. Substances which do not allow the heat to pass through them are called badĬonductors. Aluminum, copper, Silver, Steel, Bronze, Brass, all Substances which allow the heat to pass through them very easily are called Types a) Good Conductors and b) Bad conductors Upon easiness of heat transfer by conduction the substance are classifieds into Which are at different temperatures without actual migration of particles of Of heat transfer between two parts of a body or between two bodies in contact Thus heat transfer takes place by conduction. Thus the kinetic energy of the neighbouring molecules increases hence their amplitude of vibration increases and during the collision the energy transfers to the next molecule. ![]() ![]() These molecules during vibration collide with the neighbouring molecules and transfer part of their energy to the neighbouring molecules. These molecules start vibrating with a higher amplitude. The molecules start vibrating with a higher amplitude. When one end of a metal rod is heated, the kinetic energy of the molecules at that end increases. If one end of a metal rod is heated, the other end also gets heated up. ![]()
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June 2023
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