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T₂ = 0°C
L₁ = 87,2 cm
α = 0,000019/°C
L₂ = ?
L₂ = L₁ * (1 + α * ΔT)
L₂ = 87,2 * (1 + 0,000019 * (0 - 28)) = 87,15 cm