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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.
Thermal cracking occurs because the coefficient of. thermal expansion of aluminum is about five times greater than that of aluminum. oxide. If metal and oxide were each free to expand at some elevated. temperature, the metal expansion would be five times that of the oxide.