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  2. Orders of magnitude (length) - Wikipedia

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

    Leonardo da Vinci drew the Vitruvian Man within a square of side 1.83 m (6 ft 0 in) and a circle about 1.2 m (3 ft 11 in) in radius. To help compare different orders of magnitude, this section lists lengths between one meter and ten meters. Light, in vacuum, travels 1 meter in 1 ⁄ 299,792,458, or 3.3356409519815E-9 of a second.

  3. Foot (unit) - Wikipedia

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

    In 1799 the meter became the official unit of length in France. This was not fully enforced, and in 1812 Napoleon introduced the system of mesures usuelles which restored the traditional French measurements in the retail trade, but redefined them in terms of metric units. The foot, or pied métrique, was defined as one third of a meter. This ...

  4. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    The base unit in the International System of Units (SI) is the meter, defined as "the length of the path travelled by light in vacuum during a time interval of 1 ⁄ 299792458 seconds." [ 4 ] It is approximately equal to 1.0936 yd .

  5. Fathom - Wikipedia

    en.wikipedia.org/wiki/Fathom

    Miners also use it as a unit of area equal to 6 feet square (3.34 m 2) in the plane of a vein. [2] In Britain, it can mean the quantity of wood in a pile of any length measuring 6 feet (1.8 m) square in cross section. [2] In Central Europe, the klafter was the corresponding unit of comparable length, as was the toise in France.

  6. Height above mean sea level - Wikipedia

    en.wikipedia.org/wiki/Height_above_mean_sea_level

    Elevation or altitude is generally expressed as "metres above mean sea level" in the metric system, or "feet above mean sea level" in United States customary and imperial units. Common abbreviations in English are: AMSL – above mean sea level [3] ASL – above sea level [4] FAMSL – feet above mean sea level [5] FASL – feet above sea level [6]

  7. Template:Flight level - Wikipedia

    en.wikipedia.org/wiki/Template:Flight_level

    The template takes a three-digit Flight level number and converts it into feet and meters. Usage. Flight level | 10}} → FL010 (1,000 ft; 300 m)

  8. Maltese units of measurement - Wikipedia

    en.wikipedia.org/wiki/Maltese_units_of_measurement

    ~0.107 cu ft Referenced in Aquilina only. The 1921 Act uses this value for the siegħ, and does not mention the għabara by name. tomna: tmien, or tomniet 1 ~18.18 L ~0.6422 cu ft Sometimes called the tumolo in English texts. This is exactly 4 imperial gallons. modd: mdied 16 ~290.9 L ~10.27 cu ft, or ~0.3805 cu yd 'weigh'.

  9. List of visionary tall buildings and structures - Wikipedia

    en.wikipedia.org/wiki/List_of_visionary_tall...

    This is a list of buildings and other structures that have been envisioned. The X-Seed 4000 is one of the tallest structures ever conceived. Shown in this image is the Burj Khalifa (828 m (2,717 ft)), tallest structure in the world at the time of completion in 2010 to this year (2025), and the X-Seed 4000 project (4,000 m (13,000 ft)).