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単位系
Wikipedia definition
1. Planck unitsIn physics, Planck units are physical units of measurement defined exclusively in terms of five universal physical constants listed below, in such a manner that these five physical constants take on the numerical value of 1 when expressed in terms of these units. Planck units elegantly simplify particular algebraic expressions appearing in physical law.
Read “Planck units” on English Wikipedia
Read “プランク単位系” on Japanese Wikipedia
Read “Planck units” on DBpedia

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