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Coefficient of thermal expansion. The coefficient of thermal expansion describes how the size of an object changes with a change in temperature. Specifically, it measures the fractional change in size per degree change in temperature at a constant pressure. Several types of coefficients have been developed: volumetric, area, and linear.
Here, VÊ¹ is the volume of the gas, liquid, or solid at the temperature T2 > T1; V is the initial volume of the substance; and the temperature difference T2 â T1 is assumed to be small. The thermal expansion of solids is characterized by, in addition to Î±, the coefficient of linear expansion.