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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.
Alum in the form of potassium aluminium sulphate or ammonium aluminium sulfate in a concentrated bath of hot water is regularly used by jewelers and machinists to dissolve hardened steel drill bits that have broken off in items made of aluminum, copper, brass, gold (any karat), silver (both sterling and fine) and stainless steel. This is ...
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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.
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There is only one ' l ', not two. 1.) Aluminum. 2.) Aluminium. Two Ls is a mis-spelling of the word, either in American or British English. Aluminum is the more "common" perhaps, but the consensus was to use Aluminium. Either way, the anon editor's spelling with the double-ls is incorrect. Ariel ♥ Gold 16:22, 15 September 2007 (UTC)
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