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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 Conductivity Coefficient. A key part of Fourier's heat conduction equation is the coefficient of thermal conductivity, or k, of the material. The coefficient of thermal conductivity of a material is calculated using the same equation, moving variables around until we isolate k on one side. This gives us the coefficient of thermal conductivity equation: