Why is metal good conductor of heat?
Because electrons can flow relatively freely through them. Alloys conduct heat less well than pure metals – aluminium and copper, because they are made up of different materials, which means that it is more difficult for energy, in the form of the kinetic energy of electrons, to pass through the metal. The best conductors are copper and aluminium. Pure metals have a crystalline-like lattice structure between elements which allow easy transmission of electrons. These are the same properties which allow metals to carry electricity.
