Complex sentence: This concept is very theoretical (there is no such thing as a non-interacting Fermi gas, and zero temperature is impossible to achieve), however it finds some use in approximately describing white dwarfs, neutron stars, atomic nuclei, and electrons in a metal.
Split into simpler sentences: This concept is very theoretical (there is no such thing as a non-interacting Fermi gas, and zero temperature is impossible to achieve). However, it finds some use in approximately describing white dwarfs, neutron stars, atomic nuclei, and electrons in a metal.