XU - XU

Japanese: XU - えっくすゆー
XU - XU

…1 X-ray unit ≒ 1.002× 10−13 m. The symbols are X and XU in English, and XE in German. The cleavage spacing of rock salt was first calculated using Avogadro's number as 2.814× 10−8 Å, but was changed to 2814.00 X-ray units. This resulted in a slight difference, mainly due to the Avogadro's number, which led to the distinction between Å and 103 X-ray units. …

*Some of the terminology explanations that mention "XU" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…1X線単位≒1.002×10-13m。記号は英語でX,XU,ドイツ語でX.E.など。最初にアボガドロ数を使って岩塩のへき開面間隔を2.814×10-8Åと計算されているのを2814.00X線単位としたため,おもにアボガドロ数に起因するわずかの違いがでて,Åと103X線単位とは区別されるようになった。…

※「XU」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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