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It is important to consider the effect of thermal expansion when building a structure that must withstand changes in temperature. For example a metal beam will expand in hot temperatures. The additional stress could cause the structure to fail. Similarly, a material will contract in cold temperatures. The linear change in length of a material if it is allowed to freely expand is described by the following equation:
L∆ = aL0T∆
Here, L0 is the initial length of the material in meters, L∆ is the displacement in meters, T∆ is the change in temperature in Celsius, and a is a coefficient for linear expansion.
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