Hydrogen diffusion is the process by which hydrogen molecules move from areas of higher concentration to areas of lower concentration. This movement occurs due to the random motion of molecules and is influenced by factors such as temperature and pressure. In gases, hydrogen diffuses rapidly because its small molecular size allows it to travel easily through other gases. In various applications, such as in fuel cells and hydrogen storage, understanding hydrogen diffusion is crucial. Efficient diffusion can enhance the performance of these technologies, making them more effective for energy production and storage.