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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 ...

  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]

  3. Wikipedia is written by volunteer editors and hosted by the Wikimedia Foundation, a non-profit organization that also hosts a range of other volunteer projects : Commons. Free media repository. MediaWiki. Wiki software development.

  4. en.wikipedia.org › wiki › Solar_panelSolar panel - Wikipedia

    Solar array mounted on a rooftop A solar panel is a device that converts sunlight into electricity by using photovoltaic (PV) cells. PV cells are made of materials that produce excited electrons when exposed to light. The electrons flow through a circuit and produce direct current (DC) electricity, which can be used to power various devices or be stored in batteries.

  5. 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 ...

  6. 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 ...

  7. Ancient Egypt was a civilization of ancient Northeast Africa.It was concentrated along the lower reaches of the Nile River, situated in the place that is now the country Egypt.Ancient Egyptian civilization followed prehistoric Egypt and coalesced around 3100 BC (according to conventional Egyptian chronology) with the political unification of Upper and Lower Egypt under Menes (often identified ...

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