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  2. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    The French scale, French gauge or Charrière system is commonly used to measure the size of a catheter.It is most often abbreviated as Fr, but can often be seen abbreviated as Fg, FR or F.

  3. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    The United States retained the ⁠ 1 / 39.37 ⁠-metre definition for surveying, producing a 2 millionth part difference between standard and US survey inches. [47] This is approximately ⁠ 1 / 8 ⁠ inch per mile; 12.7 kilometres is exactly 500,000 standard inches and exactly 499,999 survey inches.

  4. Orders of magnitude (length) - Wikipedia

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

    120 μm – the geometric mean of the Planck length and the diameter of the observable universe: √ 8.8 × 10 26 m × 1.6 × 10 −35 m; 120 μm – diameter of a human ovum; 170 μm – length of the largest mammalian sperm cell (rat) [103] 170 μm – length of the largest sperm cell in nature, belonging to the Drosophila bifurca fruit fly ...

  5. Orders of magnitude (area) - Wikipedia

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

    List of orders of magnitude for areas 10 0 to 10 7 square metres. Factor (m 2) Multiple Value Item 10 0: 1 square metre: 1 m 2: International A0 paper (841 × 1189 mm) 1.73 m 2: A number commonly used as the average body surface area of a human [27] 1–4 m 2: Area of the top of an office desk 10 1 10–20 m 2: A parking space 70 m 2

  6. American football field - Wikipedia

    en.wikipedia.org/wiki/American_football_field

    There is a goal centered on each end line, with a crossbar 10 feet (3.0 m) above the ground and goalposts 18 feet 6 inches (5.64 m) apart (in college and the NFL) extending at least 35 feet (11 m) above the crossbar. Between the goal lines, additional lines span the width of the field at 5-yard intervals.

  7. Column inch - Wikipedia

    en.wikipedia.org/wiki/Column_inch

    This can be confusing because it refers to two distinct measurements as if they were measured with the same unit. Normally one would think a 3 by 6 advertisement would be 3 inches wide by 6 inches high — but in reality it's actually about 5.5 inches wide by 6 inches high. In writing, an "×" is usually used to separate the two figures ...

  8. Thousandth of an inch - Wikipedia

    en.wikipedia.org/wiki/Thousandth_of_an_inch

    Other common terms used in machining with Imperial units involve adding tenths together to achieve a specific tolerance or measurement. For example, "five tenths," is typically a measurement or tolerance of five ten-thousandths of an inch, and written as 0.0005 inches. "Three tenths," as another example, is written as 0.0003 inches [9]

  9. Hand (unit) - Wikipedia

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

    To convert inches to hands, the number in inches is divided by four, then the remainder is added after the radix point. Thus, a horse that measures 60 inches is 15 hands high (15 × 4 = 60) and a horse halfway between 15 and 16 hands is 15.2 hands, or 62 inches tall (15 × 4 + 2 = 62) [ 5 ] [ 7 ] Because the subdivision of a hand is a base 4 ...