= Freely rotating chain
A <freely rotating chain> has fixed bond <length> and fixed angle between successive forward bond vectors, with independently uniform torsion angles. It neglects interactions between distant chain segments. The fixed angle introduces short-range orientational correlations even though the torsional <rotations> are unrestricted. Its <characteristic ratio of a freely rotating chain> converts those correlations into an end-to-end size; its equivalent long-chain link is the <Kuhn length of a freely rotating chain>.
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