Helium abundance is a research area that focuses on studying the presence and distribution of helium gas in various environments, such as Earth's atmosphere, outer space, and natural gas reservoirs. Researchers measure the concentration of helium isotopes to understand processes like nuclear fusion, radioactive decay, and helium migration. Helium abundance studies are important for applications in geology, astronomy, and technology, as helium is a valuable resource for various industries, including healthcare, electronics, and aerospace.