All the substances, according to their resistivity and its variation with temperature, are divided into following four classes:
These have large number of free electrons (~1028/m3) and small resistivity
These have fewer conduction electrons and holes (~1016/m3). These have greater resistivity (~3 ´ 103 W m) as compared to metals.
These have practically no free electrons. These have very high resistivity.
At low temperatures, the resistance of certain substances becomes exactly zero. These substances are called superconductors and phenomena superconductivity.
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