Historically, explanation has been associated with causation: to explain an event or phenomenon is to identify its cause. But with the growth and development of philosophy of science in the 20th century, the concept of explanation began to receive more rigorous and specific analysis.
For jewelry applications, gauges 12-28 are most common. The size of wire is defined by one of two measuring systems. The American wire gauge (AWG) and the Standard wire gauge (SWG) systems.
It is impossible to draw a wire to an exact size. Ordinary practice is to draw a No. 10 B. & S. wire between 101 and 103 mils. The resulting wire may average 102 or 101.9 mils, or something different from either. A table calculated on the exact size is, therefore, as nearly right as though ordinary shop sizes were used. The weight and resistance of an actual wire will very seldom correspond with any table.