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α = 0,000011/oC
Lo = 10 m
ΔL = 8,8 mm = 88 x 10^-4
rumus ΔL= α . Lo . ΔT
88 x 10^-4 = α . 10 . 80
800α = 88 x 10^-4
α = 88 x 10^-4 / 800
α = 11 x 10^-6