Some processes happen spontaneously. What, at a macroscopic level,
appears as a nature’s tendency, is an effect of the complex statistical behaviour of the
microscopic particles: their overall net effect emerges at the macroscopic level as a
spontaneous force that determines if and how a system can spontaneously change, and
if and toward which direction a process is therefore started.
Keywords: Canonical ensemble, Canonical partition function, Crossproduct,
Momentum partition function, Phase space, Positional partition function, System
configuration, Tendency.
