The gravity model has been frequently used for explaining human geographical phenomena in the early years of the twentieth century. According to the gravity model, the migration between two places is directly proportional to the product of the population of the two centres, and inversely proportional to the square of the distance between the two.It implies that the capacity of an area to attract migrants depends upon the size of its population or its economic potential. The distance is considered as a hindrance to the population movement.
China is the world’s largest producer of Aluminum smelter. Aluminium smelting is the process of extracting aluminium from its oxide, alumina, generally by the Hall-Héroult process.
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