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Leonhard Euler's work: Mathematical notations that he introduced: Concept of a function (first to write f(x) to denote the function f applied to the argument x) [16] Letter Σ for summations; Letter i to denote the imaginary unit; Modern notation for the trigonometric functions; Natural logarithm (now also known as Euler's number) Differential ...
Aluminium foil (or aluminum foil in American English; occasionally called tin foil) is aluminium prepared in thin metal leaves. The foil is pliable and can be readily bent or wrapped around objects. Thin foils are fragile and are sometimes laminated with other materials such as plastics or paper to make them stronger and more useful.
Charles Martin Hall (December 6, 1863 – December 27, 1914) was an American inventor, businessman, and chemist.He is best known for his invention in 1886 of an inexpensive method for producing aluminum, which became the first metal to attain widespread use since the prehistoric discovery of iron.
During the 1960s the company began to license its aluminium production technology, [4] and in 1967 helped to establish Koninklijke Hoogovens' first aluminium smelter in 1967. In 1974 the company took over the Swiss-German company Lonza (founded 1897), which specialised in hydropower, construction, and electrochemical industrial production. [ 6 ]
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A tin foil hat is a hat made from one or more sheets of tin foil or aluminium foil, or a piece of conventional headgear lined with foil, often worn in the belief or hope that it shields the brain from threats such as electromagnetic fields, mind control, and mind reading.
Aluminium (or aluminum) metal is very rare in native form, and the process to refine it from ores is complex, so for most of human history it was unknown. However, the compound alum has been known since the 5th century BCE and was used extensively by the ancients for dyeing .
[4] In 1982 the company acquired the British Aluminium Company, renaming the operation British Alcan. In 1999, Alcan made a failed attempt to make a three-way merger between it and Algroup (Alusuisse Lonza Group) of Switzerland and Pechiney of France. The proposed merger was blocked by the European Commission due to fears of anti-competition ...