👉 The concept of non-accretion is a fundamental principle in physics and astrophysics that describes how matter is distributed within a system. Non-accretion refers to the absence of material flow between regions where there are no sources or sinks for the flows, such as through gravitational forces or by the motion of particles. Non-accretion occurs when the density of the fluid remains constant, regardless of its velocity. This means that the mass of any matter in a system is conserved without changing with time, and