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  2. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    If using the metric unit meters for distance and the imperial unit inches for target size, one has to multiply by a factor of 25.4, since one inch is defined as 25.4 millimeters. distance in meters = target in inches angle in mrad × 25.4 {\displaystyle {\text{distance in meters}}={\frac {\text{target in inches}}{\text{angle in mrad}}}\times 25.4}

  3. Thousandth of an inch - Wikipedia

    en.wikipedia.org/wiki/Thousandth_of_an_inch

    25.4 μm. A thousandth of an inch is a derived unit of length in a system of units using inches. Equal to 1000 of an inch, a thousandth is commonly called a thou / ˈθaʊ / (used for both singular and plural) or, particularly in North America, a mil (plural mils ). The words are shortened forms of the English and Latin words for "thousand ...

  4. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    [1] The Charrière is measured by the ''outer'' diameter, and is defined as 1 Fr = 1/3 mm, and thus 1 mm = 3 Fr; therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3. [2] The French units roughly correspond to the outer circumference of the catheter (see table below).

  5. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    A minute of arc is ⁠π 10 800⁠ of a radian . A second of arc, arcsecond (arcsec), or arc second, denoted by the symbol ″, [ 2] is ⁠ 1 60 ⁠ of an arcminute, ⁠ 1 3600⁠ of a degree, [ 1] ⁠ 1 1 296 000⁠ of a turn, and ⁠π 648 000⁠ (about ⁠ 1 206 264.8⁠) of a radian. These units originated in Babylonian astronomy as ...

  6. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    The nanometre ( SI symbol: nm) is a unit of length in the metric system equal to 10−9 metres ( ⁠ 1 1 000 000 000⁠ m = 0.000 000 001 m ). To help compare different orders of magnitude, this section lists lengths between 10 −9 and 10 −8 m (1 nm and 10 nm). 1 nm – diameter of a carbon nanotube.

  7. Radian - Wikipedia

    en.wikipedia.org/wiki/Radian

    The radian, denoted by the symbol rad, is the unit of angle in the International System of Units (SI) and is the standard unit of angular measure used in many areas of mathematics. It is defined such that one radian is the angle subtended at the centre of a circle by an arc that is equal in length to the radius. [ 2]

  8. R-value (insulation) - Wikipedia

    en.wikipedia.org/wiki/R-value_(insulation)

    The R-value (in K ⋅ m 2/ W) is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive [ 2] flow of heat, in the context of construction. [ 3]. R-value is the temperature difference per unit of heat flux needed to sustain one unit of heat flux between the ...

  9. Decimal degrees - Wikipedia

    en.wikipedia.org/wiki/Decimal_degrees

    Degree precision versus length decimal places decimal degrees DMS Object that can be unambiguously recognized at this scale N/S or E/W at equator E/W at 23N/S E/W at 45N/S E/W at 67N/S 0 1.0: 1° 00′ 0″ country or large region: 111 km: 102 km: 78.7 km: 43.5 km 1 0.1: 0° 06′ 0″ large city or district: 11.1 km: 10.2 km: 7.87 km: 4.35 km ...

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