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  2. Orders of magnitude (length) - Wikipedia

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

    1.75 m – (5 feet 8 inches) – height of average U.S. male human as of 2002 (source: U.S. CDC as per female above) 2.4 m – wingspan of a mute swan; 2.5 m – height of a sunflower; 2.7 m – length of a leatherback sea turtle, the largest living turtle; 2.72 m – (8 feet 11 inches) – tallest-known human (Robert Wadlow) [31]

  3. Mount Wilson Observatory - Wikipedia

    en.wikipedia.org/wiki/Mount_Wilson_Observatory

    The 100-inch Hooker telescope at Mt Wilson fundamentally changed the scientific view of the Universe Hooker Telescope enclosure. The 100-inch (2.5 m) Hooker telescope located at Mount Wilson Observatory, California, was completed in 1917, and was the world's largest telescope until 1949.

  4. List of metric units - Wikipedia

    en.wikipedia.org/wiki/List_of_metric_units

    Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [1] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.

  5. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    A ruler, depicting two customary units of length, the centimeter and the inch. A unit of length refers to any arbitrarily chosen and accepted reference standard for measurement of length. The most common units in modern use are the metric units, used in every country globally. In the United States the U.S. customary units are also in use.

  6. Chain (unit) - Wikipedia

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

    The UK statute chain is 22 yards, which is 66 feet (20.1168 m). This unit is a statute measure in the United Kingdom, defined in the Weights and Measures Act 1985. [6] One link is a hundredth part of a chain, which is 7.92 inches (20.1168 cm).

  7. Metrication in the United States - Wikipedia

    en.wikipedia.org/wiki/Metrication_in_the_United...

    Display sizes for screens on TVs and computer monitors are advertised and sold in inches (measured diagonally), although most boxes also state the size in centimeters. The original 1 ⁄ 4 inch (6.35 mm) phone connector jack dates back to 1878 [54] [55] [56] and still sees use in audio equipment and electric instruments. In many respects, it ...

  8. Ancient Roman units of measurement - Wikipedia

    en.wikipedia.org/wiki/Ancient_Roman_units_of...

    A Roman steelyard weight of one dodrans, i.e. 3 ⁄ 4 libra. The units of weight or mass were mostly based on factors of 12. Several of the unit names were also the names of coins during the Roman Republic and had the same fractional value of a larger base unit: libra for weight and as for coin. Modern estimates of the libra range from 322 to ...

  9. Standard-gauge railway - Wikipedia

    en.wikipedia.org/wiki/Standard-gauge_railway

    The distance between the inside edges of the heads of the rails is defined to be 1,435 mm except in the United States, Canada, and on some heritage British lines, where it is defined in U.S. customary/customary UK units as exactly "four feet eight and one half inches", [7] which is equivalent to 1,435.1 mm.

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