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  2. Prices of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Prices_of_chemical_elements

    Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars. ... and the cost of extraction of the element, at zero. ... Silicon: 2.3296: 282000 ...

  3. Silicon - Wikipedia

    en.wikipedia.org/wiki/Silicon

    These include hydrogenated amorphous silicon and upgraded metallurgical-grade silicon (UMG-Si) used in the production of low-cost, large-area electronics in applications such as liquid crystal displays and of large-area, low-cost, thin-film solar cells. Such semiconductor grades of silicon are either slightly less pure or polycrystalline rather ...

  4. List of countries by silicon production - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    This is a list of countries by silicon production in 2021, based on USGS figures. [1] Rank Country/region Silicon production (thousands of tons per year) ...

  5. Alternative approaches to redefining the kilogram - Wikipedia

    en.wikipedia.org/wiki/Alternative_approaches_to...

    This approach would define the kilogram as "the mass which would be accelerated at precisely 2 × 10 −7 m/s 2 when subjected to the per-metre force between two straight parallel conductors of infinite length, of negligible circular cross section, placed one metre apart in vacuum, through which flow a constant current of ⁠ 1 / 1.602 17 × 10 ...

  6. Energy density Extended Reference Table - Wikipedia

    en.wikipedia.org/wiki/Energy_density_Extended...

    Specific energy (MJ/kg) Energy density (MJ/L) Peak recovery efficiency % Practical recovery efficiency % Arbitrary Antimatter: 89,875,517,874: depends on density:

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  8. Polycrystalline silicon - Wikipedia

    en.wikipedia.org/wiki/Polycrystalline_silicon

    Elkem Solar estimates their UMG costs to be $25/kg, with a capacity of 6,000 tonnes by the end of 2010. Calisolar expects UMG technology to produce at $12/kg in 5 years with boron at 0.3 ppm and phosphorus at 0.6 ppm. [20] At $50/kg and 7.5 g/W, module manufacturers spend $0.37/W for the polysilicon.

  9. Ferrosilicon - Wikipedia

    en.wikipedia.org/wiki/Ferrosilicon

    Ferrosilicon is used as a source of silicon to reduce metals from their oxides and to deoxidize steel and other ferrous alloys. This prevents the loss of carbon from the molten steel (so called blocking the heat); ferromanganese, spiegeleisen, calcium silicides, and many other materials are used for the same purpose. [5]