Let d = distance between two plates, L = length of a plate, and assuming that the coefficient provided is that of linear expansion, the elongation of a section is ∆L = Lα (T₂ - T₁) = 0, 012 m . Assuming that the elongation is shared equally to both sides of each section, when two sections are in contact, it is fulfilled
[tex]\pmb{\dfrac{d}{2}=\dfrac{\Delta L}{2 }\Rightarrow d=\Delta L=0,012 m= 1,2 cm} \\\\\\\boxed{\pmb{d=1,2 \ cm}}[/tex]
