Einstein's famous mass-energy Equation E=mc^2, where E stands for energy, m for Quality, and c for Speed of Light. one important result of relativity is the relationship between Quality and energy. Quality and energy are not interchangeable, and it's based on the special theory of relativity, which he proposed in 1915. Because in classical mechanics, Quality and energy are independent and have no relationship with each other, but in relativistic mechanics, energy and Quality are interchangeable. In June 1905, Einstein published a paper, "one enlightening View on the Production and Transformation of Light," explaining the nature of light, which also won him the Nobel Prize in Physics in 1921.

Einstein mass energy Equation

energy ：E = mc²

E = energy

m = Quality

c = Speed of Light