Atoms obey different statistical laws depending
upon their character. If they contain an even
number of particles they are called
bosons and obey Bose-Einstein
statistics. If the number of particles is odd
they are called fermions and obey
Fermi-Dirac statistics. Any number of bosons
can occupy the same quantum state, whereas only
one fermion can occupy a given state.
This fact is the reason for the large
differences between bosons and fermions at low
temperatures.
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