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= 25°C
T = 40°C
α = 0,000011°C
Δt = t - t°
= 40°C - 25°C
= 15°C
L = (1 + αΔt)
= 2 ( 1 + (0,000011)(15))
= 2 (1 + 0,000165)
= 2 (1,000165)
= 2,0033 m
Jadi panjang besi itu pada suhu 40°C adalah 2,0033 m
l2=200cm/2m×1,000011×15
l2=2,000022×15
l2=30,00033m