The Hall–Héroult process is the major industrial process for smelting aluminium. It involves dissolving aluminium oxide (alumina) (obtained most often from bauxite, aluminium’s chief ore, through the Bayer process) in molten cryolite, and electrolyzing the molten salt bath, typically in a purpose-built cell.
invented by Joseph Henry
A relay is an electrically operated switch. It consists of a set of input…
invented by Alexander Parkes
Celluloids are a class of materials produced by mixing nitrocellulose and…
invented by Abraham Louis Breguet
A watch is a portable timepiece intended to be carried or worn by a person. It…
invented by John Walker
A match is a tool for starting a fire. Typically, matches are made of small…
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