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α = 1,7×10⁻⁵/°C
t₁ = 30°C
t₂ = 70°C
Δt = t₂-t₁
Δt = 40
l₀ = 50 cm
Dit = lt
Jwb =
lt = l₀.(1+α.Δt)
lt = 50.(1+1,7×10⁻⁵.40)
lt =50.(1+6,8×10⁻⁴)
lt = 50 + 3,4×10⁻²
lt = 50,034 cm