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t₁ = 20°C
t₂ = 30°C
Δt = t₂-t₁
Δt = 10°C
α = 1,2×10⁻⁵/°C
l₀ = 25 m
Dit = Δl
Jwb =
Δl = l₀.α.Δt
Δl = 25.1,2×10⁻⁵.10
Δl = 3×10⁻³
Δl = 0,003 m