  A collisionless continuous medium in Euclidean space is discussed, i.e. a
continuum of free particles moving inertially, without interacting with each
other. It is shown that the distribution density of such medium is weakly
converging to zero as time increases indefinitely. In the case of Maxwell's
velocity distribution of particles, this density satisfies the well-known
diffusion equation, the diffusion coefficient increasing linearly with time.
