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.
Wire Diameter: Typical Usage: 0.1mm wire: Used for fly tying of dry flies as very fine and also for smaller nymphs sizes 16 and smaller: 0.2mm wire: This is a thicker wire, this is used for fly tying for general nymphs, lures, streamers and is used on the Copper John and Brassie trout flies: 0.3mm wire