Superconductivity is a state of matter exhibited by some normal conductors when their resistivity suddenly drops to zero at a very low temperature. The superconductivity property of a material can be easily be effected by temperature , magnetic field and current.

Superconductivity is a property of some conductors the resistivity of which suddenly drops to zero at a certain low temperature , T_c. These materials behave as superconductors below the critical temperature , T_c and as normal conductors .

The CRITICAL TEMPERATURE is the temperature at which the normal state of a conductor changes to superconducting state. critical temperature is different for different superconductors.