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  2. Parts-per notation - Wikipedia

    en.wikipedia.org/wiki/Parts-per_notation

    At 1 ppm the solution is a very pale yellow. As the concentration increases the colour becomes a more vibrant yellow, then orange, with the final 10,000 ppm a deep red colour. In science and engineering , the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities , e.g. mole fraction or ...

  3. PPM - Wikipedia

    en.wikipedia.org/wiki/PPM

    Pashtun Tahafuz Movement (PTM), also known as the Pashtun Protection Movement (PPM), a human rights movement in Pakistan for the Pashtun people; People's Monarchist Party (Portugal) (Portuguese: Partido Popular Monárquico), a Portuguese political party; People's Progressive Movement (Cayman Islands) Progressive Party of Maldives

  4. Scientific terminology - Wikipedia

    en.wikipedia.org/wiki/Scientific_terminology

    Scientific terminology is the part of the language that is used by scientists in the context of their professional activities. While studying nature, scientists often encounter or create new material or immaterial objects and concepts and are compelled to name them.

  5. Subject matter - Wikipedia

    en.wikipedia.org/wiki/Subject_matter

    Subject matter, in general, is anything which can be content for some theory. Subject matter may refer to: Patentable subject matter (or statutory subject matter), defining whether patent protection is available; Subject-matter jurisdiction, determining the kinds of claims or disputes over which a court has jurisdiction

  6. Thesaurus - Wikipedia

    en.wikipedia.org/wiki/Thesaurus

    A thesaurus (pl.: thesauri or thesauruses), sometimes called a synonym dictionary or dictionary of synonyms, is a reference work which arranges words by their meanings (or in simpler terms, a book where one can find different words with similar meanings to other words), [1] [2] sometimes as a hierarchy of broader and narrower terms, sometimes simply as lists of synonyms and antonyms.

  7. Wikipedia:Glossary - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Glossary

    To change the subject matter of an article, a template or (most frequently) a category to one that is more acceptable for editorial or encyclopedic purposes. If by doing so the subject area is broadened, the term upscope is sometimes used. Retarget See § Repoint. Retired Describes an editor who has left Wikipedia. See Wikipedia:Retiring.

  8. Glossary of physics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_physics

    In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved. QED mathematically describes all phenomena involving electrically charged particles interacting by means of exchange of photons and represents the quantum counterpart of classical ...

  9. Peak programme meter - Wikipedia

    en.wikipedia.org/wiki/Peak_programme_meter

    A peak programme meter (PPM) is an instrument used in professional audio that indicates the level of an audio signal. Different kinds of PPM fall into broad categories: True peak programme meter. This shows the peak level of the waveform no matter how brief its duration. Quasi peak programme meter (QPPM). This only shows the true level of the ...