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1 ημέρα πριν · Download as PDF; Printable version; In other projects ... with an electrical conductivity of 1.0–1.3 × 10 4 S•cm −1, similar to that of liquid mercury. The chemistry of silicon is ... average around one third the cost of silver (US$1.5 per gram or about $45 an ounce). Boron, germanium, and arsenic samples average about three-and-a-half ...
1 ημέρα πριν · The timeline of historic inventions is a chronological list of particularly important or significant technological inventions and their inventors, where known. [a] History of technology By technological eras Premodern Prehistoric Stone Age (lithic) Neolithic Revolution Copper Age Bronze Age Iron Age Ancient Modern Proto-industrialization First Industrial Revolution Standardization Second ...
