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2. Prices of chemical elements - Wikipedia

   en.wikipedia.org/wiki/Prices_of_chemical_elements

   Prices of hydrogen produced by distributed steam methane reforming, as predicted by H2A Production Model from United States Department of Energy, [9] assuming price of natural gas of US$3/MMBtu (US$10/MWh; US$0.10/m 3). Does not include cost of storage and distribution. 1: 2 H (D) Deuterium: 0.0001667 [10] 13 400: 2.23: 2020: CIL [11]

3. Penny (United States coin) - Wikipedia

   en.wikipedia.org/wiki/Penny_(United_States_coin)

   Aluminum was chosen, and over 1.5 million samples of the 1974 aluminum cent were struck before ultimately being rejected. The cent's composition was changed in 1982 because the value of the copper in the coin started to rise above one cent. [7] Some 1982 cents used the 97.5% zinc composition, while others used the 95% copper composition.

4. Copper - Wikipedia

   en.wikipedia.org/wiki/Copper

   Recycling is a major source of copper in the modern world. [33] Price of Copper 1959–2022. The price of copper is volatile. [35] After a peak in 2022 the price unexpectedly fell. [36] The global market for copper is one of the most commodified and financialized of the commodity markets, and has been so for decades. [37]: 213

5. List of copper alloys - Wikipedia

   en.wikipedia.org/wiki/List_of_copper_alloys

   The discovery and exploitation of the Bolivian tin belt in the 19th century made tin far cheaper, although forecasts for future supplies are less positive. There are as many as 400 different copper and copper alloy compositions loosely grouped into the categories: copper, high copper alloy, brasses, bronzes, cupronickel, copper–nickel–zinc ...

6. Printed circuit board - Wikipedia

   en.wikipedia.org/wiki/Printed_circuit_board

   Copper thickness of PCBs can be specified directly or as the weight of copper per area (in ounce per square foot) which is easier to measure. One ounce per square foot is 1.344 mils or 34 micrometers thickness. Heavy copper is a layer exceeding three ounces of copper per ft 2, or approximately 0.0042 inches (4.2 mils, 105 μm) thick. Heavy ...

7. Quarter (United States coin) - Wikipedia

   en.wikipedia.org/wiki/Quarter_(United_States_coin)

   Its current version is composed of two layers of cupronickel (75% copper, 25% nickel) clad on a core of pure copper. [2] With the cupronickel layers comprising 1/3 of total weight, the coin's overall composition is therefore 8.33% nickel, 91.67% copper. Its weight is 0.1823 troy oz. or 0.2000 avoirdupois oz. (5.670 grams).