mass-energyequivalence

mass-energyequivalence
mass-en·er·gy equivalence (măsʹĕnʹər-jē) n.
The physical principle that a measured quantity of energy is equivalent to a measured quantity of mass. The equivalence is expressed by Einstein's equation, E = mc2, where E represents energy, m the equivalent mass, and c the speed of light.

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Universalium. 2010.

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