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⚛️ 质能方程 E = mc²E = mc² Calculator
E = m c²，c = 299,792,458 m/s；同时换算为千瓦时和 TNT 当量。本地处理。可设置「质量 kg」。E = m c² with c = 299,792,458 m/s, also in kWh and TNT equivalent. Processed locally. Settings: Mass kg.
使用说明与常见问题How-to & FAQ
「质能方程 E = mc²」是什么？What is the E = mc² Calculator tool?
E = m c²，c = 299,792,458 m/s；同时换算为千瓦时和 TNT 当量。本地处理。可设置「质量 kg」。E = m c² with c = 299,792,458 m/s, also in kWh and TNT equivalent. Processed locally. Settings: Mass kg.
如何使用「质能方程 E = mc²」？How do I use the E = mc² Calculator tool?
填写质量（kg），即可按 E = mc² 得到对应的能量，并换算成千瓦时和 TNT 当量。结果会随输入实时更新。Enter a mass in kg to get the energy from E = mc², also shown in kWh and TNT equivalent. The result updates as you type.
全部转化？All converted?
只有正反物质湮灭才接近完全转化；核裂变只转化约 0.1% 的质量。Only matter-antimatter annihilation comes close; fission converts about 0.1% of the mass.
能举个计算实例吗？Can you show a worked example?
例如在「质能方程 E = mc²」中填 质量 kg = 0.001，结果区显示：能量：89,875,500,000,000 J；千瓦时：24,965,400 kWh；TNT 当量：21,480.8 tFor example, entering Mass kg = 0.001 in the E = mc² Calculator gives: Energy: 89,875,500,000,000 J; Kilowatt-hours: 24,965,400 kWh; TNT equivalent: 21,480.8 t
哪些输入会被检查？Which inputs are validated?
「质能方程 E = mc²」会检查这些输入——「质量 kg」：必须填写，须大于 0；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The E = mc² Calculator checks its inputs — "Mass kg": required, must be greater than 0; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「质能方程 E = mc²」的设置：「质量 kg」默认 0.001。每次生成结果都按当前设置处理。Settings in the E = mc² Calculator — "Mass kg" default 0.001. The result always uses the current settings.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「质能方程 E = mc²」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 E = mc² 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.
「质能方程 E = mc²」免费吗？需要注册吗？Is the E = mc² Calculator free? Do I need an account?
「质能方程 E = mc²」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 E = mc² 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.