Web Reference: Sep 19, 2023 · But E=mc² asserts that mass and energy are interchangeable. In practical terms, this means that a small amount of mass can be converted into a vast amount of energy and vice versa. Feb 6, 2026 · Albert Einstein is best known for his equation E = mc2, which states that energy and mass (matter) are the same thing, just in different forms. He is also known for his discovery of the photoelectric effect, for which he won the Nobel Prize for Physics in 1921. E = mc2 —In SI units, the energy E is measured in joules, the mass m is measured in kilograms, and the speed of light is measured in metres per second. An object moves at different speeds in different frames of reference, depending on the motion of the observer.
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