 ohms divided by metres (for the length) and then multiplied by square metres (for the cross-sectional area).For example, if "A" = , formula_3 = (forming a cube with perfectly conductive contacts on opposite faces), then the resistance of this element in ohms is numerically equal to the resistivity of the material it is made of in Ω⋅m.Conductivity, σ, is the inverse of resistivity