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"In physics, E = mc2 is an important and well-known equation, which states an equivalence between energy (E) and mass (m), in direct proportion to the square of the speed of light in a vacuum (c2). See mass in special relativity for a discussion of the various definitions of mass which may be validly used with this equation.
The equation was first derived (in a slightly different formulation) in 1905 by Albert Einstein, in what are known as his Annus Mirabilis ("Wonderful year") Papers. In these, he showed that a unified four-dimensional model of space and time ("spacetime") could accurately describe observable phenomena in a way that was consistent with Galileo's Principle of Relativity, but also accounted for the constant speed of light. His special theory of relativity ultimately showed that the traditional (Euclidean-Galilean) assumption of absolute time and distance was incorrect, and, as a consequence, that mass and energy are different only in form.
Thus c² is the conversion factor required to sometimes convert from units of mass to units of energy, i.e. the energy per unit mass. In unit-specific terms, E (joules or kg·m²/s²) = m (kilograms) multiplied by (299,792,458 m/s)2."
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Last edited by dbz_may; 09-12-2006 at 03:04 PM.
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