= Depletion force
{wiki=Depletion_force}
The depletion force is a type of effective force that arises in a system of particles due to the presence of larger particles or obstacles that restrict the available volume for smaller particles. This force is often observed in colloidal systems, polymer solutions, and biological systems where different sizes of particles are present. When smaller particles (often called "depletants") are introduced into a suspension of larger particles, they tend to occupy the available space between the larger particles.
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