Atomic mass unit - Atomic mass unit
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A unit of mass for elementary particles and atoms. The symbol is "u". The mass of one carbon-12 atom is 12.0, and 1/12 of that is 1u. This value is equivalent to approximately 1.66054× 10-27 kg. The mass of each atom is a relative value based on this standard. The average of the atomic mass values of naturally occurring isotopes using their abundance rate is called the atomic weight of that atom, with the atomic weight of oxygen being 16.0 and that of nitrogen being 14.0. Source: Kodansha Dictionary of Unit Names Information |
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素粒子・原子などの質量の単位。記号は「u」。炭素12の原子1個の質量を12.0として、その12分の1を1uとする。その値は約1.66054×10-27kgに相当する。各原子の質量は、これを基準にした相対値となる。天然に存在する同位体の原子質量の値を存在率を使って平均した値を、その原子の原子量といい、酸素の原子量は16.0、窒素は14.0になる。
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