PHYS 523 Lecture 2: HEAT_TRANSFER
3 Jul 2022
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Document Summary
Heat is transferred in matter through the following methods: conduction, convection and radiation. This is the transfer of heat in solids. Conductivity is the ability of a material to conduct heat. Good conductors of heat are those materials which are able to transfer heat easily and steadily. Bad conductors are those which do not conduct heat. When done correctly and carefully the matchsticks will fall off in the following order: copper, aluminium, brass and finally iron. This shows that different metals conduct heat at different rates. Good conductors: they are used to manufacture cooking utensils, they are used as liquids suitable for thermometers i. e. mercury, used as heat dumps (metal clips) when soldering delicate components in a circuit board i. e. transistors. This is the transfer of heat through fluids (liquids and gases). This occurs when part of the fluid is heated: they become less dense and rise above the cold fluid. As they move they carry heat with them.
