Coefficient of linear expansion of a solid is defined as the increase in the length of a rod of the solid per unit initial length per unit rise in its temperature. Coefficient of linear expansion of a solid, λ = \(\cfrac{l_2-l_1}{l_1ΔT}\), where l1 and l2 are respectively the initial and final length of the rod of the solid and ΔT is the rise in its temperature.
Unit of λ = \(\cfrac{unit \,of \,length}{unit \,of \,length\times unit \,of \,temperature}\)
