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  2. Copper - Wikipedia

    en.wikipedia.org/wiki/Copper

    Copper is the 26th most abundant element in Earth's crust, representing 50 ppm compared with 75 ppm for zinc, and 14 ppm for lead. [ 28 ] Typical background concentrations of copper do not exceed 1 ng/m 3 in the atmosphere; 150 mg/kg in soil; 30 mg/kg in vegetation; 2 μg/L in freshwater and 0.5 μg/L in seawater.

  3. MW 50 - Wikipedia

    en.wikipedia.org/wiki/MW_50

    MW 50 (Methanol-Wasser 50) was a 50-50 mixture of methanol and water (German: Wasser) that was often sprayed into the supercharger of World War II aircraft engines primarily for its anti-detonation effect, allowing the use of increased boost pressures. Secondary effects were cooling of the engine and charge cooling.

  4. Lockheed Martin F-35 Lightning II - Wikipedia

    en.wikipedia.org/wiki/Lockheed_Martin_F-35...

    The F-35 was the product of the Joint Strike Fighter (JSF) program, which was the merger of various combat aircraft programs from the 1980s and 1990s. One progenitor program was the Defense Advanced Research Projects Agency (DARPA) Advanced Short Take-Off/Vertical Landing (ASTOVL) which ran from 1983 to 1994; ASTOVL aimed to develop a Harrier jump jet replacement for the U.S. Marine Corps ...

  5. Median lethal dose - Wikipedia

    en.wikipedia.org/wiki/Median_lethal_dose

    In toxicology, the median lethal dose, LD 50 (abbreviation for "lethal dose, 50%"), LC 50 (lethal concentration, 50%) or LCt 50 is a toxic unit that measures the lethal dose of a given substance. [1] The value of LD 50 for a substance is the dose required to kill half the members of a tested population after a specified test duration.

  6. Toyota Camry (XV50) - Wikipedia

    en.wikipedia.org/wiki/Toyota_Camry_(XV50)

    The Toyota Camry (XV50) is a mid-size car produced by Toyota from August 2011 to August 2020. Replacing the XV40 series, the XV50 represents the seventh generation of the Toyota Camry in all markets outside Japan, which follows a different generational lineage.

  7. Joint Service General Purpose Mask M-50/M-51 - Wikipedia

    en.wikipedia.org/wiki/Joint_Service_General...

    The lifetime ownership cost of the mask was reduced by 50% when compared with the M40 series mask due to a lower repair part count, all maintenance being completed at the operator and unit level and color coding of repair parts which decreased on-hand repair part inventory. [7] United States Marine Corps member is wearing a M50 mask

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