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Related to mass-energy equivalence: E=mc2
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.
The principle that mass and energy can be converted into each other and that a particular quantity of mass is equivalent to a particular quantity of energy. The principle was stated mathematically by Albert Einstein as E = mc2, where E is the energy in ergs, m is the mass in grams, and c is the speed of light in centimeters per second.
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|Noun||1.||mass-energy equivalence - (physics) the principle that a measured quantity of mass is equivalent (according to relativity theory) to a measured quantity of energy|
principle, rule - a rule or law concerning a natural phenomenon or the function of a complex system; "the principle of the conservation of mass"; "the principle of jet propulsion"; "the right-hand rule for inductive fields"