Electricity primarily travels along the outside of the conductor. So the more "strands" you have the better in most instances.
Most of the current travels on the surface of the wire. The more strands the more surface area and the lower the effective resistance.
7 strands of 29 gauge (AWG) wire
A pressure gauge indicates actual pressure and a differential pressure gauge indicates the difference in pressure.
20 gauge is larger
The size of the bore.
16 gauge is thicker than 18 gauge.
16 gauge pipe is thicker than 19 gauge pipe.
Size of the bore.
Yes, you can use two strands of double knit yarn held together to substitute for an aran weight yarn in a pattern. This will create a similar thickness and gauge as aran weight yarn, but be sure to swatch and adjust your needle size as needed to match the pattern's gauge.
12 has a bigger bore.
For optimal performance and sound quality, you should consider using light gauge guitar strings. Light gauge strings are easier to play and produce a brighter tone compared to heavier gauge strings.
26 gauge is your common metal mailbox 26 gauge is comparable to the skin on an elevator door.