why e=mc2

E = mc2
E: refers to the object in the nuclear fission generated energy.
m: object quality
c: the speed of light in the vacuum
That is, the energy released by the object in the process of nuclear fission is equal to the mass of the object with the square of the speed of light!

e = mc2 is not the most basic formula, but from the narrow sense of relativity in a conclusion. Einstein's (generalized) theory of relativity, together with quantum theory, is the two cornerstones of modern physics. The simplest, if people do not know the theory of relativity, the satellite is not heaven, gps one day failure, the basic all astronomical observations are wrong, not to mention nuclear and atomic bombs and so on.

Another implication of this formula is to expose the relationship between matter and energy. Classical physics thinks that (please remember your high school class), the energy of the object only with his state (such as speed, charge) and his interaction with the field (such as electromagnetic field, gravitational field) related. The theory of relativity reveals that the actual energy of the object, but also with their own quality. Quality is also a measure of energy.

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