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  2. Pitch (resin) - Wikipedia

    en.wikipedia.org/wiki/Pitch_(resin)

    Natural bitumen pitch, from the tar pit above the McKittrick Oil Field, Kern County, California. Pitch is a viscoelastic polymer which can be natural or manufactured, derived from petroleum, coal tar, [1] or plants. Pitch produced from petroleum may be called bitumen or asphalt, while plant-derived pitch, a resin, is known as rosin in its solid ...

  3. Tar - Wikipedia

    en.wikipedia.org/wiki/Tar

    Asphalt (naturally occurring pitch) may also be called either "mineral tar" or "mineral pitch". There is a tendency to use "tar" for more liquid substances and "pitch" for more solid (viscoelastic) substances. [2] Both "tar" and "pitch" are applied to viscous forms of asphalt, such as the asphalt found in naturally occurring tar pits (e.g., the ...

  4. Pitch drop experiment - Wikipedia

    en.wikipedia.org/wiki/Pitch_drop_experiment

    A pitch drop experiment is a long-term experiment which measures the flow of a piece of pitch over many years. "Pitch" is the name for any of a number of highly viscous liquids which appear solid, most commonly bitumen, also known as asphalt. At room temperature, tar pitch flows at a very low rate, taking several years to form a single drop.

  5. Birch bark tar - Wikipedia

    en.wikipedia.org/wiki/Birch_bark_tar

    Birch bark tar use as an adhesive began in the Middle Paleolithic. Neanderthals produced tar through dry distillation of birch bark as early as 200,000 years ago. [6] A 2019 study demonstrated that birch bark tar production can be a simpler, more discoverable process by directly burning birch bark under overhanging stone surfaces in open-air conditions. [7]

  6. Flat roof - Wikipedia

    en.wikipedia.org/wiki/Flat_roof

    An important consideration in tarred flat roof quality is knowing that the common term 'tar' applies to rather different products: tar or pitch (which is derived from wood resins), coal tar, asphalt and bitumen. Some of these products appear to have been interchanged in their use and are sometimes used inappropriately, as each has different ...

  7. Mysterious Tar Balls Shut Down Florida Beaches As Coast Guard ...

    www.aol.com/mysterious-tar-balls-shut-down...

    Mysterious tar balls washed up on several Florida beaches, forcing closures and triggering an investigation by the U.S. Coast Guard. Fort Lauderdale’s shoreline was among the most impacted ...

  8. Coal tar - Wikipedia

    en.wikipedia.org/wiki/Coal_tar

    Coal tar was one of the first chemical substances proven to cause cancer from occupational exposure, during research in 1775 on the cause of chimney sweeps' carcinoma. [13] Modern studies have shown that working with coal tar pitch, such as during the paving of roads or when working on roofs, increases the risk of cancer. [17]

  9. ‘Sleep Revolution Cheat Sheet’ by Huffington Post

    testkitchen.huffingtonpost.com/sleep-revolution...

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