A circular mil (often abbreviated as cmil or kcmil) is a unit of area used primarily in the United States for measuring the cross-sectional area of a round wire or cable. It is a convenient unit for specifying the size of electrical conductors.
One circular mil is equal to the area of a circle with a diameter of one mil (1/1000th of an inch) or approximately 0.000000506707 square inches (in²). In metric units, one circular mil is approximately equal to 0.000001273 square millimeters (mm²).
Circular mils are commonly used in the American Wire Gauge (AWG) system to specify wire sizes. The AWG system assigns a unique number to each wire size, and this number is related to the wire's cross-sectional area in circular mils. For example, a larger AWG number corresponds to a smaller wire size with fewer circular mils, while a smaller AWG number corresponds to a larger wire size with more circular mils. This system allows for easy reference and selection of wire sizes for various electrical applications.
The "vara conuquera cuadrada" is another historical unit of land area measurement used in some Spanish-speaking countries, particularly in parts of Latin America. Like the "vara castellana cuadrada," it measures land area in square varas, but it is a regional variation and not part of the standard metric system.
The exact length of the "vara conuquera cuadrada" can vary by region, but it is generally close to 100 square varas, with each square vara having a specific length determined locally. The term "conuquera" is associated with the conuco, a type of small-scale agricultural plot traditionally used in some Latin American countries for subsistence farming.
As with other historical units of measurement, the use of the "vara conuquera cuadrada" is not standardized and is mostly a part of local customs and traditions. Official land measurements and land records in many Spanish-speaking countries have transitioned to more standardized systems, such as metric units, for land area measurements.