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  2. Shot grouping - Wikipedia

    en.wikipedia.org/wiki/Shot_grouping

    Tightness of shot groupings are calculated by measuring the maximum distance between any two bullet holes on the target (center-to-center) in length measurements such as millimeters or inches. Often that measurement is converted into angular measurements such as milliradians ("mils" or "mrads") or minutes of angle (MOAs), which expresses the ...

  3. Board foot - Wikipedia

    en.wikipedia.org/wiki/Board_foot

    The board foot or board-foot is a unit of measurement for the volume of lumber in the United States and Canada [1]. It equals the volume of a board that is one foot (30.5 cm) in length, one foot in width, and one inch (2.54 cm) in thickness, or exactly 2.359 737 216 liters .

  4. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    One brass is exactly 100 square feet (9.29 m 2) area (used in measurement of work done or to be done, such as plastering, painting, etc.). The same word is used, however, for 100 cubic feet (2.83 m 3 ) of estimated or supplied loose material, such as sand, gravel, rubble, etc.

  5. Driller's depth - Wikipedia

    en.wikipedia.org/wiki/Driller's_depth

    One methodology that has been introduced is called Driller Way-point Depth (patent applied) [3] which results in true along-hole depth. The measurement uncertainty is then a combination of the drill pipe length measurement accuracy, how accurately the correction parameters are measured, and the fidelity of the correction model applied.

  6. Prince Rupert's cube - Wikipedia

    en.wikipedia.org/wiki/Prince_Rupert's_cube

    Place two points on two adjacent edges of a unit cube, each at a distance of 3/4 from the point where the two edges meet, and two more points symmetrically on the opposite face of the cube. Then these four points form a square with side length 3 2 4 ≈ 1.0606601. {\displaystyle {\frac {3{\sqrt {2}}}{4}}\approx 1.0606601.}

  7. Surface feet per minute - Wikipedia

    en.wikipedia.org/wiki/Surface_feet_per_minute

    SFM is a combination of diameter and the velocity of the material measured in feet-per-minute as the spindle of a milling machine or lathe. 1 SFM equals 0.00508 surface meter per second (meter per second, or m/s, is the SI unit of speed). The faster the spindle turns, and/or the larger the diameter, the higher the SFM.

  8. Acre-foot - Wikipedia

    en.wikipedia.org/wiki/Acre-foot

    Since an acre is defined as a chain by a furlong (i.e. 66 ft × 660 ft or 20.12 m × 201.17 m), an acre-foot is 43,560 cubic feet (1,233.5 m 3). There has been two definitions of the acre-foot (differing by about 0.0006%), using either the international foot (0.3048 m) or a U.S. survey foot (exactly ⁠ 1200 / 3937 ⁠ meters since

  9. Napkin ring problem - Wikipedia

    en.wikipedia.org/wiki/Napkin_ring_problem

    The band gets thicker, and this would increase its volume. But it also gets shorter in circumference, and this would decrease its volume. The two effects exactly cancel each other out. In the extreme case of the smallest possible sphere, the cylinder vanishes (its radius becomes zero) and the height equals the diameter of the sphere