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The formula E = mc^2 was started from special relativity. It means that a particle of mass m has the energy content of mc^2. However, it does not mean that any type of energy is equivalent to a mass m = E/c^2. In fact, it has been proven that the electromagnetic energy alone is not equivalent to mass . This misinterpretation was initiated by Einstein although he failed to prove that any energy has a mass equivalent for many years (1905-1909). This misinterpretation is responsible to overlooking the charge-mass interaction from the Reissner-Nordstrom Metric. This static repulsive force is crucial for the unification between gravitation and electromagnetism .
References: 1. C. Y. Lo, The Question of E = mc2 and Rectification of Einstein’s General Relativity, GJSFR Vol. 14, Issue 2, Version 1.0 (2014). 2. "Einstein's Miraculous Year" edited and introduced by John Stachel, Princeton Univ. Press (1998), p. 118. — Preceding unsigned comment added by ChungYLo (talk • contribs) 23:46, 25 April 2014 (UTC)
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The following two claims appear in the Efficiency paragraph: "mass cannot be converted to energy" and "the mass is not destroyed, but simply removed from the system. in the form of heat and light from the reaction"
Maybe it's just me, but it seems as though if it is first mass, and then heat and light, wasn't there a conversion? Maybe the article should just stay away from the word "convert" if the basic idea is that they are equivalent.220.127.116.11 (talk) 19:43, 30 October 2014 (UTC)
You're right, that paragraph is definitely confusing. It should distinguish between rest mass (of the matter particles) and the total mass (inertia--gravitation) of the system (including that of any light or other forms of energy). Just as you wouldn't say "light can be converted to energy", you can't say "rest mass can be converted to energy"; it already is energy (namely in a form called rest energy). Rest mass can be converted to *other* forms of energy (light, etc.). From another point of view, the system as a whole exhibits its total mass (via inertia and gravitation phenomena) and this mass depends only on the total energy of the system; thus, because the total energy can't change, this overall system's mass can't change either. In other words the light or other forms of energy contribute exactly the same amount of mass to the system as did the matter they replaced. DavRosen (talk) 22:05, 30 October 2014 (UTC)