Construct · 3 fields · 3 citations
One name. Different field. Different construct. One map.
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In polymer physics a coil is the shape a long flexible chain takes on its own: free rotation about its many bonds lets the molecule wander back on itself into a loose, fluctuating tangle, whose average size is described statistically rather than drawn exactly. Flory's 1949 The configuration of real polymer chains gave the account of how excluded-volume and bond geometry set the coil's dimensions. The referent is the ensemble-averaged size and shape of a molecular chain, measured by its radius of gyration, and it has nothing to do with a wound wire or a heat-exchanger except the shared picture of something curled up.[1]
In electromagnetics a coil is a length of wire wound into turns so that current through it builds a concentrated magnetic field, giving the device an inductance that opposes changes in that current and lets it store magnetic energy. Wheeler's 1950 Inductance chart for solenoid coil provides the practical relations between a coil's turns and geometry and its inductance. The referent is a wound conductor characterised by its inductance in henries, a different construct from a tangled polymer or a plumbing fitting, joined to them only by the word for something wound.[2]
In reproductive medicine the coil is the everyday name for an intrauterine device, a small shaped object placed inside the uterus to prevent pregnancy, so called because early versions were bent or wound into loops and spirals. Roy and Azen's 1994 A reanalysis of the Cu-7 intrauterine contraceptive device clinical trial reports the effectiveness of one such copper device. The referent is a contraceptive implant judged by pregnancy and continuation rates, entirely separate from an electrical coil or a polymer coil beyond the shared image of a curled shape.[3]
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