Einstein's tenth paper, Does the Inertia of a Body Depend on its Energy Content? Annalen der Physik 18: pg. 639-641.Using the postulates of the special theory of relativity, Einstein showed that energy radiated is equivalent to mass lost, which would eventually lead to the famous equation: E=mc2.
He considered the conservation of energy of a radiating body in a system at rest and in a system in uniform motion relative to it. For the first time he concluded that "the mass of a body is a measure of its energy content.
"The special theory of relativity paved the way for a deeper appreciation of symmetry criteria in physics and introduced new views on space and time, yet it took twenty-five years for experimental evidence in its favor to emerge.
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