Presenting a New Equation that Accurately Determines the Size of a Moving Elementary Particle

The paper briefly presents a new Eq. (9). The role of Eq. (9) is to accurately determine the size of a moving elementary particle, depending on its velocity (or particle energy). Although Eq. (9) has a general character, it can be applied to any elementary particle in motion to determine the size of that particle, in the study, it was applied only to the particles of hydrogen nuclei of its first three isotopes. The purpose of the application is to determine exactly the size of hydrogen isotopes according to their energy, to use in industrial systems for obtaining nuclear energy, fusion, fission, and, in the future, even the annihilation of matter-antimatter. In this way, it will be possible to achieve industrial-scale fusion with convenient efficiency in the coming years and a little later it will be possible to develop systems for obtaining energy from annihilations.