  Friction forces acting on rotators may promote their alignment and therefore
eliminate degrees of freedom in their movement. The alignment of rotators by
friction force was demonstrated by experiments performed with different
spinners, demonstrating how friction generates negentropy in a system of
rotators. A gas of rigid rotators influenced by friction force is considered.
The orientational negentropy generated by a friction force was estimated with
the Sackur-Tetrode equation. The minimal change in total entropy of a system of
rotators, corresponding to their eventual alignment, decreases with
temperature. The reported effect may be of the primary importance for a phase
equilibrium and motion of ubiquitous colloidal and granular systems.
