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⚛️ 平均原子质量计算器Average Atomic Mass Calculator
输入一种元素各同位素的质量（u）和丰度（%），计算加权平均原子质量；丰度之和不等于 100% 时会提示并按比例归一。Enter the mass (u) and abundance (%) of each isotope of an element to get the weighted average atomic mass; if the abundances do not add up to 100% the tool says so and normalises them.
使用说明与常见问题How-to & FAQ
「平均原子质量计算器」是什么？What is the Average Atomic Mass Calculator tool?
输入一种元素各同位素的质量（u）和丰度（%），计算加权平均原子质量；丰度之和不等于 100% 时会提示并按比例归一。Enter the mass (u) and abundance (%) of each isotope of an element to get the weighted average atomic mass; if the abundances do not add up to 100% the tool says so and normalises them.
如何使用「平均原子质量计算器」？How do I use the Average Atomic Mass Calculator tool?
在「平均原子质量计算器」中，填写上方字段等参数，结果会随输入实时计算并显示在下方。In the Average Atomic Mass Calculator: Fill in the fields above; results are recalculated instantly as you type.
怎么算？How is it calculated?
平均原子质量 = Σ（同位素质量 × 丰度）÷ Σ丰度。默认例子是氯：³⁵Cl 34.96885 u（75.76%）和 ³⁷Cl 36.96590 u（24.24%），结果约 35.45 u，与 IUPAC 标准原子量一致。Average atomic mass = Σ(isotope mass × abundance) ÷ Σ abundance. The default is chlorine: ³⁵Cl at 34.96885 u (75.76%) and ³⁷Cl at 36.96590 u (24.24%), giving about 35.45 u, in line with the IUPAC standard atomic weight.
同位素质量能用质量数代替吗？Can I use mass numbers instead?
可以粗算（如 35 和 37），但结果会有约 0.03 u 的偏差。精确计算请用同位素的实测原子质量。For a rough answer (35 and 37), yes, but the result will be off by about 0.03 u. Use measured isotope masses for accuracy.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「平均原子质量计算器」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Average Atomic Mass Calculator uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「平均原子质量计算器」免费吗？需要注册吗？Is the Average Atomic Mass Calculator free? Do I need an account?
「平均原子质量计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Average Atomic Mass Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.