Aluminum is a white-silver soft metal. It is the most abundant metallic element in the earth's crust. It is found in bauxite combined with oxygen and other elements and must be converted into its metallic state. In ordinary commercial and industrial use, the word "aluminum" is often understood to mean aluminum alloy, rather than pure metal. The addition of alloying elements modifies the properties and characteristics of aluminum. Such aspects as density, electrical and thermal conductivity, thermal expansion, mechanical properties, ability to finish and harden, and corrosion resistance are all affected by combining the alloying elements with aluminum. Alloying alone does not provide aluminum with all of its desirable characteristics. Alumin
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