16-gauge wire has a diameter of 0.05082 inches.
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The gauge of wire that is 12 volt is 18, 14, and 16.
AWG # 12 is 2.053 mm in diameter.
Heavier wires do not necessarily mean better sound. Typically, 18 or 16 guage wire is sufficient for home audio systems. If you are going to be running extremely long distances, say 100 feet or more, then increase the gauge size to like 14 or 12 to keep from losing too much audio signal. In a car, 18 guage wire should be quite sufficient.
Yes, a #12 AWG conductor has a greater diameter than a #14 AWG conductor. A #12 conductor has an ampacity of 20 amps whereas a #14 conductor only has an ampacity of 15 amps.
The size of the wire is stated by its gauge under American Wire Gauge. Six gauge wire is size 6 AWG.