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  2. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    For instance the same angle of 0.1 mrad will subtend 10 mm at 100 meters, 20 mm at 200 meters, etc., or similarly 0.39 inches at 100 m, 0.78 inches at 200 m, etc. Subtensions in mrad based optics are particularly useful together with target sizes and shooting distances in metric units. The most common scope adjustment increment in mrad based ...

  3. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    It is especially popular as a unit of measurement with shooters familiar with the imperial measurement system because 1 MOA subtends a circle with a diameter of 1.047 inches (which is often rounded to just 1 inch) at 100 yards (2.66 cm at 91 m or 2.908 cm at 100 m), a traditional distance on American target ranges.

  4. Metric prefix - Wikipedia

    en.wikipedia.org/wiki/Metric_prefix

    A similar system is used in natural gas sales in the United States: m (or M) for thousands and mm (or MM) for millions of British thermal units or therms, and in the oil industry, [30] where MMbbl is the symbol for "millions of barrels". This usage of the capital letter M for "thousand" is from Roman numerals, in which M means 1000. [31]

  5. Metric drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    From 1.0 through 2.95 mm, sizes are defined as follows, where N is an integer from 10 through 29: N · 0.1 mm; N · 0.1 + 0.05 mm; From 3.0 through 13.9 mm, sizes are defined as follows, where N is an integer from 30 through 139: N · 0.1 mm; From 14.0 through 25.0 mm, sizes are defined as follows, where M is an integer from 14 through 25: M ...

  6. Drop (unit) - Wikipedia

    en.wikipedia.org/wiki/Drop_(unit)

    metric teaspoon In the United Kingdom , subsequent to the adoption of the minim and the creation of the British imperial system of units in the 1820s, a drop is defined as 1 British imperial minim , [ 3 ] the equivalence of ⁠ 1 / 60 ⁠ of a British imperial fluid drachm or ⁠ 1 / 480 ⁠ of a British imperial fluid ounce .

  7. Torr - Wikipedia

    en.wikipedia.org/wiki/Torr

    The millimeter of mercury by definition is 133.322387415 Pa [5] (13.5951 g/cm 3 × 9.80665 m/s 2 × 1 mm), which is approximated with known accuracies of density of mercury and standard gravity. The torr is defined as ⁠ 1 / 760 ⁠ of one standard atmosphere, while the atmosphere is defined as 101325 pascals.

  8. Per mille - Wikipedia

    en.wikipedia.org/wiki/Per_mille

    The 50‰ grade is equivalent to 50 m/km or 5%. Main article: Grade (slope) Gradients (in some countries in Europe ) may be expressed as mm/m or m/km, and written with the per mille symbol.

  9. Coaxial power connector - Wikipedia

    en.wikipedia.org/wiki/Coaxial_power_connector

    There are a number of sizes listed below that appear to be quite similar, and while the tolerances of these connectors are typically indicated as ±0.05 or ±0.03 mm by the manufacturers, there is still ambiguity as to whether two sizes differing by only 0.05 mm (or where the specification is only given to the nearest 0.10 mm) warrants listing ...