Silver is the best conductor of electricity among the following. It has a conductivity of 62.5 x 10^6 S/m, followed by copper with 58.5 x 10^6 S/m, aluminum with 36 x 10^6 S/m, and iron with 10 x 10^6 S/m.
Conductivity is a measure of how easily an electric current can flow through a material. Materials with high conductivity are good conductors of electricity, while materials with low conductivity are poor conductors.
The conductivity of a material depends on its atomic structure. Materials with atoms that are close together and have free electrons are good conductors of electricity. Silver has a very dense atomic structure and a high number of free electrons, which makes it the best conductor of electricity.
Copper is also a good conductor of electricity, but it is not as good as silver. Aluminum is a good conductor of electricity, but it is not as good as copper or silver. Iron is a poor conductor of electricity.