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A mil
Posted by WoodyS (more from WoodyS) on Wed, 11 May 2005 08:57:53
In Reply to: Darn inches..., Mattias.se, Wed, 11 May 2005 06:18:15
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A mil is simply 1/1000 (0.001) inch.
A circular mil is a unit of area used especially when denoting the cross-sectional size of a wire or cable. It is the equivalent area of a circle whose diameter is 0.001 (10-3) inch, or approximately 0.7854 millionths of a square inch (or 2.5 x 10-7 times pi).
In plane geometry, area always varies in direct proportion to the square of the linear dimension. Thus, if wire A is twice the diameter of wire B, then wire A has four times the cross-sectional area, in circular mils, of B. If wire C is 1/5 of the diameter of wire D, then C has 1/25 the cross-sectional area, in circular mils, of D. In this respect, the circular mil is like any other unit for measurement of area.
Because the circular mil is, as its name implies, based on a circular unit of measure rather than a rectangular unit, conversions between circular mils and square units such as the meter squared (m2) or centimeter squared (cm2) can be awkward. To convert circular mils approximately to meters squared (m2), multiply by 5.066 x 10-10. Conversely, multiply by 1.974 x 109. To convert circular mils approximately to centimeters squared (cm2), multiply by 5.066 x 10-6. Conversely, multiply by 1.974 x 105.
Also see area, meter squared, centimeter squared, foot squared, International System of Units (SI), and Table of Physical Units.
posted by 68.74.12...
Dictionary of Units
Posts in this Thread:
- cylinder head, Dan , Tue, 10 May 2005 06:06:21
- Re: cylinder head, SWEDECAR , Tue, 10 May 2005 17:45:55
- Darn inches..., Mattias.se, Wed, 11 May 2005 06:18:15
- A mil, WoodyS, Wed, 11 May 2005 08:57:53 <-- Viewing This Message
- Re: cylinder head, Dean, Tue, 10 May 2005 08:36:52
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