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At = luas akhir (m², cm²)
Ao = luas awal (m², cm²)
β = 2α = koefisien muai luas (/°C)
Δt = selisih suhu (°C)
Diket
Ao = 20 x 10 = 200 cm²
β = 2α = 2 x 0,000012 = 0,000024
Δt = 260 - 10 = 250°C
At = 200 (1 + 0,000024 x 250)
At = 200 x 1,006
At = 201,2 cm²
Jadi luas plat bertambah sebesar 1,2 cm²