| 释义 |
原子量yuánzǐliàng元素原子的相对质量。将质量数为12的碳原子的质量定为12,其他元素的原子量就是该元素原子质量和这种碳原子质量的比值。如氢的原子量为1.0079,氧的原子量为15.9994。{atomic weight; average mass of an atom of an element, generally expressed relative to the mass of carbon 12, which is assigned a 12 atomic mass unit, e.g. the atomic weight of hydrogen is 1.0079, while that of oxygen is 15.9994} |