BARION of gr . Bariums, 'heavy, pesantez', as in barometer, barycenter and the suffix -on, as in positron, electron, neutron; Subatomic particle possessing 3 quarks (hence its name). Baryons are fermions affected by strong nuclear interaction, and are therefore subject to the Pauli exclusion principle. Plank showed that subatomic particles can have different amounts of energy, i.e. increases or decreases by steps. It can be described by the Fermi-Dirac statistic, which tells us how much that amount is worth as a function of chemical potential and temperature.