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  1. Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene. Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar. Its properties are similar to polyethylene, but it is slightly ...

    • (C₃H₆)ₙ
    • 0.855 g/cm³, amorphous, 0.946 g/cm³, crystalline
    • None
    • 130 to 171 °C (266 to 340 °F; 403 to 444 K)
  2. Polyethylene terephthalate (or poly (ethylene terephthalate), PET, PETE, or the obsolete PETP or PET-P ), is the most common thermoplastic polymer resin of the polyester family and is used in fibres for clothing, containers for liquids and foods, and thermoforming for manufacturing, and in combination with glass fibre for engineering resins. [5]

    • (C₁₀H₈O₄)ₙ
    • 10–50 kg/mol, varies
    • > 250 °C (482 °F; 523 K) 260 °C
    • Practically insoluble
  3. Leucippus was a Greek philosopher of the 5th century BCE. He is credited with founding atomism, with his student Democritus. Leucippus divided the world into two entities: atoms, indivisible particles that make up all things, and the void, the nothingness between the atoms. Leucippus's ideas were influential in ancient and Renaissance philosophy.

  4. en.wikipedia.org › wiki › 00 - Wikipedia

    0 (zero) is a number representing an empty quantity. Adding 0 to any number leaves that number unchanged. In mathematical terminology, 0 is the additive identity of the integers, rational numbers, real numbers, and complex numbers, as well as other algebraic structures. Multiplying any number by 0 has the result 0, and consequently, division ...

  5. en.wikipedia.org › wiki › WikiWiki - Wikipedia

    Wiki " (pronounced [wiki] [note 1]) is a Hawaiian word meaning "quick". [4] [5] [6] The online encyclopedia project Wikipedia is the most popular wiki-based website, as well being one of the most popular websites on the entire internet, having been ranked consistently as such since at least 2007. [7] Wikipedia is not a single wiki but rather a ...

  6. en.wikipedia.org › wiki › HelloHello - Wikipedia

    According to the Oxford English Dictionary, hello is an alteration of hallo, hollo, [1] which came from Old High German " halâ, holâ, emphatic imperative of halôn, holôn to fetch, used especially in hailing a ferryman". [5] It also connects the development of hello to the influence of an earlier form, holla, whose origin is in the French ...

  7. The International Space Station (ISS) is a large space station assembled and maintained in low Earth orbit by a collaboration of five space agencies and their contractors: NASA (United States), Roscosmos (Russia), JAXA (Japan), ESA (Europe), and CSA (Canada). The ISS is the largest space station ever built. Its primary purpose is to perform ...

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