质能等价 Mass–energy equivalence
（重定向自Massenergy）
E = mc²（读作E等于mc 二次方，亦称质能转换公式或质能方程）是一种阐述能量（E）与质量（m）间相互关系的理论物理学公式，公式中的c是物理学中代表光速的常数。
Massenergy
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Mass–energy equivalence 质能等价
（重定向自Massenergy）
In physics, mass–energy equivalence is a concept formulated by Albert Einstein that explains the relationship between mass and energy. It expresses the law of equivalence of energy and mass using the formula
where E is the energy of a physical system, m is the mass of the system, and c is the speed of light in a vacuum (about 3×10 m/s). In words, energy equals mass multiplied by the speed of light squared. Because the speed of light is a very large number in everyday units, the formula implies that any small amount of matter contains a very large amount of energy. Some of this energy may be released as heat and light by chemical or nuclear transformations. This also serves to convert units of mass to units of energy, no matter what system of measurement units used.
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