In mesocsopical systems, interactions described with action fluxes in a mechanical system are flow of impulse. (See attachments.)
Lev
Учесть особенности движения мезоскопических систем можно на основе необратимого по времени уравнения движения,
В этом уравнении взаимодействия описываются потоком действия, а отклик системы соответствующими потоками, которые в конкретном случае принимают определённый смысл. Применительно к механическому движению потоком действия является поверхностная плотность потока импульса.
The equations of motion of classical mechanics cannot be used without change when we consider mesoscopic particles, the reason for this being that mesoscopic particles do not retain their individuality as they move. This question reminded me of a paragraph in Prandtl and Tietjens, Fundamentals of Hydrodynamics and Aeromechanics (Dover Ed. p. 9):
"We have not yet taken into account the fact that the molecules are in a state of perpetual movement. If this molecular motion be disregarded, then each volume element will always contain the same molecules and will thus have a physical individuality; the effect of molecular motion will be to destroy such physical individuality, since the molecules will be continually changing their position."
As the question is posed, the answer is quite possibly yes. There are numerous examples of, e.g., brownian particles moving in effective media represented in the general eqs of motion by random forces.
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