Define resistivity.

Resistivity is the property of the material of the conductor and is independent of dimensions, the shape of the conductor; and it is also a constant of proportionality from the relation,

And has units ohm m or Ωm, where 1Ωm is the amount of resistivity possessed by the conductor having a resistance of 1Ω and length of 1m along with the area of cross-section 1m².