Jisho

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半径
Wikipedia definition
1. Van der Waals radiusThe van der Waals radius, rw, of an atom is the radius of an imaginary hard sphere which can be used to model the atom for many purposes. It is named after Johannes Diderik van der Waals, winner of the 1910 Nobel Prize in Physics, as he was the first to recognise that atoms had a finite size (i.e. , that atoms were not simply points) and to demonstrate the physical consequences of their size through the van der Waals equation of state.
Read “Van der Waals radius” on English Wikipedia
Read “ファンデルワールス半径” on Japanese Wikipedia
Read “Van der Waals radius” on DBpedia

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