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Aluminium (or aluminum in North American English) is a chemical element; it has symbol Al and atomic number 13. Aluminium has a density lower than that of other common metals, about one-third that of steel. It has a great affinity towards oxygen, forming a protective layer of oxide on the surface when exposed to air.
The introduction of these methods for the mass production of aluminium led to extensive use of the light, corrosion-resistant metal in industry and everyday life. Aluminium began to be used in engineering and construction. In World Wars I and II, aluminium was a crucial strategic resource for aviation.
Welded aluminium alloy bicycle frame, made in the 1990s. An aluminium alloy (UK/IUPAC) or aluminum alloy (NA; see spelling differences) is an alloy in which aluminium (Al) is the predominant metal. The typical alloying elements are copper, magnesium, manganese, silicon, tin, nickel and zinc.
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This course is based on improving skills in written Spanish and critical reading of advanced Spanish and Latin American literature. [1] [2] It is typically taught as a Spanish V or VI course. The AP Spanish Literature course is designed to be comparable to a third-year college/university introductory Hispanic literature course.
Many internal combustion engines use cast iron and steel extensively for their strength and low cost. Aluminum offers lighter weight at the expense of strength, hardness and often cost. However, with care it can be substituted for many of the components and is widely used. Aluminum crank cases, cylinder blocks, heads and pistons are commonplace.
Aluminium toxicity is known to result from high levels of aluminium in water used to prepare dialysate; therefore, aluminium levels in water supplies used to prepare dialysate must be measured on a regular basis, especially in regions where aluminium is added to the water supply as well as areas with high aluminium concentrations in ground or ...