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L₁ = 10 cm
α = 0,000024/°C
T₂ = 100°C
ΔT = T₂ - T₁ = 100 - 10 = 90°C
L₂ = ?
L₂ = L₁ * (1 + α * ΔT)
L₂ = 10 * (1 + 0,000024 * 90) = 10,0216 cm