Thermal Expansion

The change in length of a material with change in temperature.

Most materials expand when they are heated. The linear thermal expansion coefficient α is the thermal strain per K.

If the material is thermally isotropic, the volumetric expansion per degree is 3α. If it is anisotropic, two or more coefficients are required and the volumetric expansion is the sum of the principal thermal strains.


See also: Linear Thermal Expansion.

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Subjects: Thermodynamics