Answer
Uranium enrichment is a process of increasing the concentration of the uranium-235 isotope in uranium. It is a crucial step in the production of nuclear fuel and weapons. The enrichment process developed by Willard Libby, known as the "Libby Method," utilizes gaseous diffusion to separate uranium-235 from uranium-238. This method employs porous barriers that selectively allow the lighter uranium-235 isotope to pass through, resulting in a higher concentration of uranium-235.