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Thermal expansion coefficient is a material property that describes how much the size of a substance changes with a change in temperature. It is typically expressed as a ratio of the fractional change in size to the change in temperature. For most materials, the volume, area, and length all increase as temperature increases. This phenomenon is known as thermal expansion. Conversely, when temperature decreases, most materials contract.
The linear thermal expansion coefficient, often denoted by the Greek letter alpha (α), specifically refers to the
The value of the thermal expansion coefficient varies significantly between different materials. Metals generally have higher