The present paper further develops some previous results associated with the variation in mass of a system
starting from first sub microscopic principles and the constitution of real space. The wave function ψ
determined in a phase space is treated as an image of the original field of inertia determined in the real space,
which is generated by the moving particle. Carriers of this field, inertons, are responsible for the exchange of
mass between the substance's entities (atoms or molecules that move or vibrate in the substance). The
overlapping of inerton clouds results in the emission and re-absorption of inertons by vibrating entities. Thus the
mass of atoms in a substance is not a stationary parameter, but dynamic. Methods of submicroscopic mechanics
allow a detailed study of a mass dynamics in the substance in question. Moreover, the inerton field can be
excited in a substance and can affect other substances inducing new effects, such as ?freezing? and clusterization
of entities, which can give rise to new chemicals. Besides, those are inertons that synchronize the coherent
motion of ultracool atoms bringing them to the cluster state, which is identified with the phenomenon of
Bose-Einstein condensation.
