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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 ...
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.
Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases.
When editors themselves translate text into English, care must always be taken to include the original text, in italics (except for non-Latin-based writing systems, and best done with the {} template which both italicizes as appropriate and provides language metadata); and to use actual and (if at all possible) common English words in the ...
Some essays represent widespread norms; others only represent minority viewpoints. This essay is supposed to document things (such as processes, for instance) that are different from the English language Wikipedia in other Wikipedias.
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The Spanish language is one of many major languages with limited use in science and technology. The main cause of this is the proliferation of English in scientific writing, which has been ongoing since English displaced French and German as the languages of science in the first half of the 20th century. [9]