4.5×10^-6 is the average coefficient of thermal expansion of this sample.
6300 pp means, if l=10^6
then Δl=630
Δl=∝lΔt
6300=∝×10^6×1400
∝=4.5×10^-6
The phenomena known as thermal expansion can be seen in solids, liquids, and gases. In this procedure, the application of heat causes an object or body to expand (temperature).
The rate of change in length per degree of temperature change is known as the coefficient of linear expansion. Every material has a linear expansion coefficient as an inherent quality. As a result, it differs depending on the substance. The cohesive force between the atoms determines how quickly a material expands .A cohesive force is what holds two or more atoms together.
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