This formula describes the equivalence of mass and energy. According to the Einstein relationship ( E = mc 2), this binding energy is proportional to this mass difference, and it is known as the mass defect.Į=mc 2 represents the new conservation principle – the conservation of mass energy. The difference is a measure of the nuclear binding energy which holds the nucleus together. Mass was no longer considered unchangeable in the closed system. It was found the rest mass of an atomic nucleus is measurably smaller than the sum of the rest masses of its constituent protons, neutrons, and electrons. Still, the mass and energy associated with such matter remain unchanged in quantity in all of these processes. In the special theory of relativity, certain types of matter may be created or destroyed. The total energy of an object was understood to comprise its rest mass and its increase of mass caused by the increase in kinetic energy. The mass of an object was seen as equivalent to energy, interconvertible with energy, and increasing significantly at exceedingly high speeds near that of light. Because the speed of light is a very large number, the formula implies that any small amount of matter contains a very large amount of energy. In other words, energy equals mass multiplied by the speed of light squared. Equivalence of the mass and energy is described by Einstein’s famous formula E = mc 2. One of the striking results of Einstein’s theory of relativity is that mass and energy are equivalent and convertible one into the other. At the beginning of the 20th century, the notion of mass underwent a radical revision.
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