ABSTRACT
Before we discuss the conditions under which the results of the preceding chapter are valid it is useful first to derive some properties of a different kind of gas. This is a gas of particles that obey the Pauli exclusion principle; such an assembly is said to obey Fermi-Dirac statistics (again named after the discoverers) as opposed to the Bose-Einstein statistics we have already considered. Examples of gases that would obey Fermi-Dirac statistics are a gas of He3 atoms or an electron gas.
