2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/163615Brownian motion of particle interacting with atoms of ideal gas is discussed as a key problem of kinetics lying at the border between ``dead'' systems like the Lorentz gas or formal constructs of conceptual Boltzmannian kinetics and actual ``alive'' systems like mere gas possessing scaleless (1/f) fluctuations in their kinetic characteristics (e.g. in diffusuvity and mobility of the ``Brownian particle'').14 pages, no figures, LaTeX elsart3pStatistical MechanicsSoft Condensed Mattertext