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.
The gauge of a piece of wire is a measurement of its width (diameter). Gauge is often abbreviated as ga, thus 20 gauge = 20ga. There are two main gauge systems used to determine wire size for crafters and artisans. American Wire Gauge is typically (but not always) the way jewelry wire is measured in the United States and Canada. Standard Wire Gauge (SWG) is typically (but not always) the measurement system used in Great Britain.