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密度
Wikipedia definition
1. Planck densityThe Planck density is the unit of density, denoted by ρP, in the system of natural units known as Planck units. ≈ 5.1 × 10 kg/m where: mP is the Planck mass lP is the Planck length c is the speed of light in a vacuum is the reduced Planck constant G is the gravitational constant This is a unit which is very large, about equivalent to 10 solar masses squeezed into the space of a single atomic nucleus.
Read “Planck density” on English Wikipedia
Read “プランク密度” on Japanese Wikipedia
Read “Planck density” on DBpedia

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