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Defined by QUDT VOCAB Quantity Kinds Release 2.1.25
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Linear Thermal Expansion
When the temperature of a substance changes, the energy that is stored in the intermolecular bonds between atoms changes. When the stored energy increases, so does the length of the molecular bonds. As a result, solids typically expand in response to heating and contract on cooling; this dimensional response to temperature change is expressed by its coefficient of thermal expansion. Different coefficients of thermal expansion can be defined for a substance depending on whether the expansion is measured by: linear thermal expansion, area thermal expansion, or volumetric thermal expansion.