How is conductiity related to resitivity and conductance to resistance?

Resistivity of a conducting wire:

How is molar conductivity related to conductivity of a solution? Derive the units of molar conductivity.

How is evaporation related to humidity ?

How is cooling related to evaporation ?

The metallic conductor is at temperature theta_1 . The temperature of metallic conductor is increased to theta_2 . How will the product of its resistivity and conductivity change?