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In physics, what does the 'c' represent in E=mc²?

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The speed of light

The equation, formulated by Albert Einstein, expresses the equivalence of mass and energy. Because the speed of light is a very large number, a small amount of mass can be converted into a huge amount of energy.

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  • In the mass-energy equivalence formula E=mc², what does the letter 'c' stand for?

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