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  2. Rack unit - Wikipedia

    en.wikipedia.org/wiki/Rack_unit

    Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

  3. Column inch - Wikipedia

    en.wikipedia.org/wiki/Column_inch

    The column inch size for advertisements that spread over more than one column is determined by multiplying the number of inches high by number of columns. For example, an advertisement that is 3 columns wide by 6 inches high takes up 18 column inches (3 columns wide multiplied by 6 inches high).

  4. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    The French scale measures the outer diameter of the catheter, not the size of the internal drainage channel (inner diameter). For instance, a two-way catheter of 20 Fr and a three-way catheter of 20 Fr have the same outer diameter, but the three-way catheter has an additional channel for irrigation, reducing the size of its drainage channel.

  5. Brannock Device - Wikipedia

    en.wikipedia.org/wiki/Brannock_Device

    Brannock spent two years developing a simple means of measuring the length, width, and arch length of the human foot. ... 5 + 13 ⁄ 16 inches (148 mm) 6 inches (152 ...

  6. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    2.54 centimeters (1 inch is exactly 2.54 cm) 25.4 millimetres (1 inch is exactly 25.4 mm) ⁠ 1 / 12 ⁠ or 0.08333 feet ⁠ 1 / 36 ⁠ or 0.2777 yards; 10000 'tenths' [a] 1000 thou [b] or mil [c] 100 points [d] or gries [e] 72 PostScript points [f] 10, [g] [e] 12, [h] or 40 [i] lines; 6 computer picas [j] 3 barleycorns [k] 0.999998 US Survey ...

  7. Orders of magnitude (length) - Wikipedia

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

    4.600 Mmwidth of the Mediterranean Sea; 4.800 Mm – length of the Sahara; 4.800 Mm – widest width of Atlantic Ocean (U.S.-Northern Africa) 5.100 Mm – distance from Dublin to New York as the crow flies; 6.270 Mm – length of the Mississippi-Missouri River system; 6.380 Mm – length of the Yangtze River; 6.400 Mm – Length of the ...

  8. Tree measurement - Wikipedia

    en.wikipedia.org/wiki/Tree_measurement

    The average girth, height, and crown spread values were calculated for the measurements included in the listing. For the dataset the average height was 87.6 feet, the average girth was 100.1 inches, and the average spread was 54.9 feet. It is not critical that these values be exact for analysis purposes.

  9. Display size - Wikipedia

    en.wikipedia.org/wiki/Display_size

    The size of a screen is usually described by the length of its diagonal, which is the distance between opposite corners, typically measured in inches. It is also sometimes called the physical image size to distinguish it from the "logical image size," which describes a screen's display resolution and is measured in pixels. [1] [2]