# Question: The relationship Lf Li 1 T is an approximation

The relationship Lf = Li (1 + αΔT) is an approximation that works when the average coefficient of expansion is small. If α is large, one must integrate the relationship dL/dT =αL to determine the final length.
(a) Assuming that the coefficient of linear expansion is constant as L varies, determine a general expression for the final length.
(b) Given a rod of length 1.00 m and a temperature change of 100.0°C, determine the error caused by the approximation when α = 2.00 X 10-5 (°C)-1 (a typical value for a metal) and when & = 0.020 0 (°C)-1 (an unrealistically large value for comparison).

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