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Lo = 10m,
Selisih suhu ΔT = 20° C.
Memakai rumus
Δ L = koefisien x Lo x Δ T
= ( 12 x 10^-6) x (10) x (20)
= (12 x 10^-5) x (20) = 24 x 10^-4 m
= 24 x 10^-4 x 10^-3 mm
= 2,4 mm. (B)