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  1. Pneumono­ultra­micro­scopic­silico­volcano­coniosis is the longest word in the English language. The word can be analysed as follows: This word was invented in the daily meeting from the National Puzzlers' League (N.P.L.) by its president Everett M. Smith. The word featured in the headline for an article published by the New York Herald ...

  2. Current ISO 3166 country codes. The sortable table below contains the three sets of ISO 3166-1 country codes for each of its 249 countries, links to the ISO 3166-2 country subdivision codes, and the Internet country code top-level domains (ccTLD) which are based on the ISO 3166-1 alpha-2 standard with the few exceptions noted.

    • History
    • Chemical and Physical Properties
    • Production
    • Manufacturing from Polypropylene
    • Applications
    • Recycling
    • Repairing
    • Health Concerns
    • Combustibility
    • External Links

    Phillips Petroleum chemists J. Paul Hogan and Robert Banks first demonstrated the polymerization of propylene in 1951. The stereoselective polymerization to the isotactic was discovered by Giulio Natta and Karl Rehn in March 1954. This pioneering discovery led to large-scale commercial production of isotactic polypropylene by the Italian firm Monte...

    Polypropylene is in little aspects similar to polyethylene, especially in solution behavior and electrical properties. The methyl group improves mechanical properties and thermal resistance, although the chemical resistance decreases.: 19 The properties of polypropylene depend on the molecular weight and molecular weight distribution, crystallinity...

    Polypropylene is produced by the chain-growth polymerization of propene: The industrial production processes can be grouped into gas phase polymerization, bulk polymerization and slurrypolymerization. All state-of-the-art processes use either gas-phase or bulk reactor systems. 1. In gas-phase and slurry-reactors, the polymer is formed around hetero...

    Melting process of polypropylene can be achieved via extrusion and molding. Common extrusion methods include production of melt-blown and spun-bond fibers to form long rolls for future conversion into a wide range of useful products, such as face masks, filters, diapers and wipes. The most common shaping technique is injection molding, which is use...

    As polypropylene is resistant to fatigue, most plastic living hinges, such as those on flip-top bottles, are made from this material. However, it is important to ensure that chain molecules are oriented across the hinge to maximise strength. Polypropylene is used in the manufacturing of piping systems, both ones concerned with high purity and ones ...

    Most polypropylene recycling uses mechanical recycling, as for polyethylene: the material is heated to soften or melt it, and mechanically formed it into new products. As of 2015, less than 1% of polypropylene generated was recycled. Heating degrades the carbon backbone more severely than for polyethylene, breaking it into smaller organic molecules...

    PP objects can be joined with a two-part epoxyglue or using hot-glue guns. PP can be melted using a speed tip weldingtechnique. With speed welding, the plastic welder, similar to a soldering iron in appearance and wattage, is fitted with a feed tube for the plastic weld rod. The speed tip heats the rod and the substrate, while at the same time it p...

    The advocacy organization Environmental Working Group classifies PP as of low to moderate hazard.[why?]PP is dope-dyed; no water is used in its dyeing, in contrast with cotton.

    Like all organic compounds, polypropylene is combustible. The flash point of a typical composition is 260 °C; autoignition temperatureis 388 °C.

  3. Calcium carbonate is the active ingredient in agricultural lime and is produced when calcium ions in hard water react with carbonate ions to form limescale. It has medical use as a calcium supplement or as an antacid, but excessive consumption can be hazardous and cause hypercalcemia and digestive issues. [8] Chemistry.

  4. en.wikipedia.org › wiki › UreaUrea - Wikipedia

    Urea, also called carbamide (because it is a diamide of carbonic acid ), is an organic compound with chemical formula CO (NH2)2. This amide has two amino groups (– NH2) joined by a carbonyl functional group (–C (=O)–). It is thus the simplest amide of carbamic acid .

  5. American Cemetery, where the film's opening and closing scenes are set. Saving Private Ryan is a 1998 American epic war film directed by Steven Spielberg and written by Robert Rodat. Set in 1944 in France during World War II, it follows a group of soldiers, led by Captain John Miller ( Tom Hanks ), on their mission to locate Private James ...

  6. 1920 × 1080 (FHD) FHD ( Full HD) is the resolution used by the 1080p and 1080i HDTV video formats. It has a 16:9 aspect ratio and 2,073,600 total pixels, i.e. very close to 2 megapixels, and is exactly 50% larger than 720p HD ( 1280 × 720) in each dimension for a total of 2.25 times as many pixels.