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α = 0,000017/°C
Δt = t₁ - to
= 30°C - 25°C
= 5°C
Ditanyakan : L₁ (Lo + ΔL)
Penyelesaian : ΔL = α . Lo . Δt
= 0,000017 . 100 . 5
= 0,0085 m
L₁ = Lo + ΔL
= 100 m + 0,0085 m
= 100,0085 m