“E = mc²”

— Albert Einstein

The equivalence of mass and energy was originally expressed by the equation m = L/c², which easily translates into the far more well known E = mc² in Does the Inertia of a Body Depend Upon Its Energy Content? http://www.fourmilab.ch/etexts/einstein/E_mc2/www/ published in the Annalen der Physik (27 September 1905) : "If a body gives off the energy L in the form of radiation, its mass diminishes by L/c²."
In a later statement explaining the ideas expressed by this equation, Einstein summarized: "It followed from the special theory of relativity that mass and energy are both but different manifestations of the same thing — a somewhat unfamiliar conception for the average mind. Furthermore, the equation E = mc², in which energy is put equal to mass, multiplied by the square of the velocity of light, showed that very small amounts of mass may be converted into a very large amount of energy and vice versa. The mass and energy were in fact equivalent, according to the formula mentioned before. This was demonstrated by Cockcroft and Walton in 1932, experimentally."
Atomic Physics (1948) by the J. Arthur Rank Organisation, Ltd. ( Voice of A. Einstein. http://www.youtube.com/watch?v=gTlpJ9ue04w)
1900s

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German-born physicist and founder of the theory of relativi… 1879–1955

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