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  2. Orders of magnitude (length) - Wikipedia

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

    1.6 cm – length of a Jaragua Sphaero, a very small reptile; 1.7 cm – length of a Thorius arboreus, the smallest salamander [111] 2 cm – approximate width of an adult human finger; 2.54 cm – 1 inch; 3.08568 cm – 1 attoparsec; 3.4 cm – length of a quail egg [112] 3.5 cmwidth of film commonly used in motion pictures and still ...

  3. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    The French scale measures and is proportional to the outer diameter of a catheter, with 1 French (Fr) defined as 1 ⁄ 3 millimeter, making the relationship: 1 mm = 3 Fr. Thus, the outer diameter of a catheter in millimeters can be calculated by dividing the French size by 3. [ 2 ]

  4. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    Centimeters (cm) are avoided as they cause confusion when reading plans. For example, the length two and a half meters is usually recorded as 2500 mm or 2.5 m; it would be considered non-standard to record this length as 250 cm. [7] [8]

  5. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    A common adjustment value in firearm sights is 1 cm at 100 meters which equals ⁠ 10 mm / 100 m ⁠ = ⁠ 1 / 10 ⁠ mrad. The true definition of a milliradian is based on a unit circle with a radius of one and an arc divided into 1,000 mrad per radian, hence 2,000 π or approximately 6,283.185 milliradians in one turn , and rifle scope ...

  6. Shoe size - Wikipedia

    en.wikipedia.org/wiki/Shoe_size

    The last is typically longer than the foot heel to toe length by 4 ⁄ 3 cm (13.33 mm) to 5 ⁄ 3 cm (16.67 mm), or 2 to 2 + 1 ⁄ 2 Paris points, so to determine the shoe size based on actual foot length one must add 2 Paris points. Because a Paris point is 2 ⁄ 3 of a centimetre, a centimetre is 3 ⁄ 2 Paris points, and the formula is as ...

  7. English units - Wikipedia

    en.wikipedia.org/wiki/English_units

    165 mm or 152 mm: Width of the hand and outstretched thumb, 6 + 1 ... and the next town as 2 1/2 bushels. ... a unit of length equal to 16.5 feet. [23]

  8. Metric prefix - Wikipedia

    en.wikipedia.org/wiki/Metric_prefix

    A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic . Each prefix has a unique symbol that is prepended to any unit symbol.

  9. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    A fire hydrant marked as 3-inch. The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement.It is equal to ⁠ 1 / 36 ⁠ yard or ⁠ 1 / 12 ⁠ of a foot.