Steel Thermal Expansion Coefficient

Steel thermal expansion coefficient αL.definition: the temperature rises 1 ℃, the relative elongation of objects.
Thermal expansion coefficient is not constant, but varies slightly with temperature, with increasing temperature.

Original length L1, L2 of the size warmed, ΔL is the amount of deformation (L2-L1) T1 is the original temperature, T2 is the temperature of the warmed, ΔT is the temperature difference (T2-T1)

Body temperature changes due to swelling phenomenon occurs called "thermal expansion." Usually refers to external pressure under the same circumstances, most of the material at elevated temperatures, its volume increases, the temperature is lowered the volume is reduced. Under the same conditions, the maximum expansion of the gas, followed by expansion of the liquid, solid minimal swelling. A small number of substances in a certain temperature range, the temperature rises, but its volume is reduced. Because the body temperature, the average kinetic energy of the molecular motion increases, the distance between molecules increases, consequent expansion of volume of the object; temperature decreases, the average kinetic energy of the object when the cooling becomes small molecules, intermolecular distance is shortened, so the volume of the object will shrink. Also, because the average kinetic energy of the different size of the solid, liquid and gaseous molecular motion, and thus the thermal expansion of the macroscopic phenomena from the point of view also significant differences.