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A ductile, silvery white metal usually with dull lustre owing to a surface film of aluminum oxide, aluminum is light, weighing approximately one-third as much as an equal volume of copper or steel. It is corrosion-resistant, is an excellent conductor of heat and electricity, reflects both light and radiant heat, is nonmagnetic, does not readily absorb neutrons, can be safely used with foods and medicines, and can be formed by all known metalworking processes. Aluminum can be joined by welding, brazing, soldering, adhesive bonding, riveting, stitching, or stapling and by means of a number of mechanical assemblies such as nuts ...(100 of 5703 words)