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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.
If a large number of small gaps exist between the splkat and the substrate, a significant thermal resistance may be felt at this interface. In general, a heat transfer coefficient, 'h', is used to quantify the contact between the melt or solidified metal and the substrate. It is therefore expected that the value of h will depend both on the fraction of surface area in good contact and on the reduced heat transfer over the non-contact[areas.