Einstein's famous mass-energy equation, e = MC 2, e stands for energy, m stands for mass, and c stands for the speed of light. An important result of relativity is the relationship between mass and energy. Mass and energy are not interchangeable and are based on special relativity. 19 15 years, he proposed the general theory of relativity. Because in classical mechanics, mass and energy are independent of each other. Energy and mass are interchangeable. Einstein's paper "An Inspiring Viewpoint on the Generation and Transformation of Light" published in June 1905 explained the essence of light, which won him the Nobel Prize in 192 1 year.

e = MC ^ 2。 E is energy in joule (j). M is the mass in kilograms (Kg). C is the speed of light, c = 3 *10.8m/s 。