How is 1 circular mil ohm/foot = 1.66242611301 x 10-7 ohm centimeter dervied?
Unit conversion: A &quot;circular mil&quot; is the area of a circle with a diameter of 0.001 inch (0.0254mm). That's about 5.07 * 10^-4 mm^2, or 5.07 * 10^-6 cm^2.
A foot is 30.48 cm.
1 circular mil / 1 foot = 5.07 * 10^-6 cm^2 / 30.48 cm = 1.66 * 10^-7 cm.
&quot;ohm&quot; is just along for the ride.