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t₁ = 20°C
t₂ = 120°C
Δt = t₂-t₁
Δt = 100°C
l₀ = 1 m
α = 2,4×10⁻⁵/°C
Dit = lt
Jwb =
lt = l₀.(1+α.Δt)
lt = 1.(1 +2,4×10⁻⁵.100)
lt = 1.(1 + 2,4×10⁻³)
lt = 1+2,4×10⁻³
lt =1,0024 m