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  2. Mercury sulfide - Wikipedia

    en.wikipedia.org/wiki/Mercury_sulfide

    β-HgS precipitates as a black solid when Hg(II) salts are treated with H 2 S. The reaction is conveniently conducted with an acetic acid solution of mercury(II) acetate. With gentle heating of the slurry, the black polymorph converts to the red form. [6] β-HgS is unreactive to all but concentrated acids. [4]

  3. ATA 100 - Wikipedia

    en.wikipedia.org/wiki/ATA_100

    ATA 100 contains the reference to the ATA numbering system which is a common referencing standard for commercial aircraft documentation. This commonality permits greater ease of learning and understanding for pilots, aircraft maintenance technicians, and engineers alike.

  4. Cinnabar - Wikipedia

    en.wikipedia.org/wiki/Cinnabar

    Mercury(II) sulfide, HgS, adopts the cinnabar structure described, and one additional structure, i.e. it is dimorphous. [16] Cinnabar is the more stable form, and is a structure akin to that of HgO : each Hg center has two short Hg−S bonds (each 2.36 Å ), and four longer Hg···S contacts (with 3.10, 3.10, 3.30 and 3.30 Å separations).

  5. Mercury (element) - Wikipedia

    en.wikipedia.org/wiki/Mercury_(element)

    The richest mercury ores contain up to 2.5% mercury by mass, and even the leanest concentrated deposits are at least 0.1% mercury (12,000 times average crustal abundance). It is found either as a native metal (rare) or in cinnabar, metacinnabar, sphalerite, corderoite, livingstonite and other minerals, with cinnabar (HgS) being the most common ore.

  6. Hennebergisches Gymnasium "Georg Ernst" - Wikipedia

    en.wikipedia.org/wiki/Hennebergisches_Gymnasium...

    The Hennebergische Gymnasium "Georg Ernst" (HGS) is a public grammar school with Alumnat (boarding school, privately sponsored) in the Thuringian city of Schleusingen. Founded in June 1577 by the Georg Ernst, Earl of Henneberg, it is one of the oldest continuously operated high schools in Germany. [1] The Gymnasium sees itself as a humanistic ...

  7. HydroGeoSphere - Wikipedia

    en.wikipedia.org/wiki/HydroGeoSphere

    HydroGeoSphere (HGS) is a 3D control-volume finite element groundwater model, and is based on a rigorous conceptualization of the hydrologic system consisting of surface and subsurface flow regimes. [ 1 ] [ 2 ] The model is designed to take into account all key components of the hydrologic cycle .

  8. Exhaust gas - Wikipedia

    en.wikipedia.org/wiki/Exhaust_gas

    Exhaust gas or flue gas is emitted as a result of the combustion of fuels such as natural gas, gasoline (petrol), diesel fuel, fuel oil, biodiesel blends, [1] or coal. According to the type of engine, it is discharged into the atmosphere through an exhaust pipe , flue gas stack , or propelling nozzle .

  9. Tuned exhaust - Wikipedia

    en.wikipedia.org/wiki/Tuned_exhaust

    A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.