Where delta V and V 0 are the volume change and original volume, respectively, and a V represents the volume coefficient of thermal expansion. The change in length with temperature for a solid material can be expressed as: Most solid materials expand upon heating and contract when cooled. Definition of Coefficient of Thermal Expansion Thermal expansion finds useful application in bimetallic strips for the construction of thermometers but can generate detrimental internal stress when a structural part is heated and kept at constant length.įor a more detailed discussion of thermal expansion including theory and the effect of crystal symmetry, the reader is referred to the CINDAS Data Series on Material Properties, Volumes 1 to 4, Thermal Expansion of Solids (Ref 1). Over small temperature ranges, the thermal expansion of uniform linear objects is proportional to temperature change. Different substances expand by different amounts. THE COEFFICIENT OF LINEAR thermal expansion (CTE, a, or a 1) is a material property that is indicative of the extent to which a material expands upon heating. Excerpt from ASM International Thermal Properties of Metals Chapter 2 Thermal Expansion
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