Thermal conductivity. Aim To be able to compare the thermal conductivities of a range of materials. Conduction. Hot. Cold. Direction of heat transfer.
To be able to compare the thermal
conductivities of a range of materials.
Direction of heat transfer
Heat energy can be transferred by conduction. When materials are heated, the atoms vibrate more. This kinetic energy can be passed from atom to atom in conducting materials. Conduction happens in all materials, but in good conductors like metals, free electrons can transfer the heat energy more quickly. All metals are good conductors of heat. Insulators do not have free electrons and conduct heat poorly. Explain why metals always feel cold to the touch, whereas wood for example feels warm ?
Materials, petroleum jelly, drawing pins, stop clock, safety glasses, tripod, heat mat, Bunsen burner
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